Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b24ac68c54f3b43…

MALICIOUS

PDF

87.0 KB Created: 2021-03-05 16:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6405b66924c8bc99e1e83744e832905e SHA-1: 9738e473a63c593f463644679a3ea6bcdfec8398 SHA-256: 1b24ac68c54f3b43f36f9b69a5e2e68976aba6ad835c73c2fffb066e4440ae71
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm and a callback lure, suggesting it is designed to direct users to malicious websites or engage them in a scam. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, some on disposable hosting, indicates a phishing or SEO abuse attempt. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/aws?utm_term=how+to+replace+battery+in+cordless+phone PDF link annotation
    • https://cdn.sqhk.co/gagunewatevo/hfhdjha/96767060359.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/jdjage1/word_of_the_day_vocabulary_builder.pdfIn PDF document text
    • https://cdn.sqhk.co/zonurubo/MjgjeYX/amazon_cloth_face_masks_made_in_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_602d9cbc54eeb.pdfIn PDF document text
    • https://cdn.sqhk.co/zarifabidit/h3rugeW/strikeforce_kitty_last_stand_hacked_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5fdbd8d238ce2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476274/normal_5ffebeb1c8f33.pdfIn PDF document text
    • https://cdn.sqhk.co/salusasopuvi/ehhjfif/creative_destruction_player_count.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_60208c84998f6.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/BgfheYo/h_and_m_coupons_october_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5ff54ee54497d.pdfIn PDF document text
    • https://cdn.sqhk.co/bezizafosu/gugeLic/lodixe.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/jwGiaih/walmart_pencil_thin_christmas_tree.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/hazeijm/ice_age_village_hack_appvn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/06753f04-a1f0-4f1c-941a-d020d7278136/fabivukuratave.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/worksheet_for_grade_1.pdfIn PDF document text
    • http://lakugarim.rf.gd/android_9._0_apk_not_installed.pdfIn PDF document text
    • http://vujesidewu.rf.gd/xojinowemiwenejinukujub.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_88f6617cf05944178862a3dd6d273b94.pdf?index=trueIn PDF document text
    • http://fatesixinubumot.epizy.com/39249635373.pdfIn PDF document text
    • http://manovubiludigi.rf.gd/guns_germs_and_steel_summary_chapter_12.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_d42262759aa04cc792103415e15f5e07.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_50d17c2654484c3d868ce29c73596b89.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_3acc48b46fde4b64bd889d6d8a0ef854.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_50c2d9c2adc2472b8f02341316fea061.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0576d3-3e5b-405f-b8cd-a7cd78ad84a3/mathematics_textbook_for_class_7_solutions.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 5244 bytes
SHA-256: 28f7babea8e531d2abbd76550caf31506eb2a6922c9a1fc61218fc88d159c9d8
font_01_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 11140 bytes
SHA-256: 8f53e11ff06a6b70cff6367e8807922ae473cc5f1c09904c688830d6f86d2006
font_02_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.