Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b4a3b6ff02f4c3…

MALICIOUS

PDF

79.2 KB Created: 2021-03-15 13:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3d3e783c0785c30ca8347a1f1be8abd2 SHA-1: f4785b0e0887d69f1ebe9bc328cf634ab033d3a1 SHA-256: 41b4a3b6ff02f4c314fe2b300817d0d2beab4d5c75acf26e6107f86bef8847d2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is for SEO manipulation or to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous external URLs and the ML classifier's high confidence score point towards a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/wix?keyword=polynesian+religion+name PDF link annotation
    • https://cdn.sqhk.co/mugodetutag/qjagjge/mobile_top_up_store.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/aieibhe/ocotillo_restaurant_phoenix_arizona.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/nonavunugorojo_xinezuwit.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/1j48Yhi/52296123473.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/4jrjbUO/difabafojikojiviremexufo.pdfIn PDF document text
    • https://sewokowoxukipa.weebly.com/uploads/1/3/4/8/134846336/tubanivu.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/eddaaa24af408.pdfIn PDF document text
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/simonaku_nuzalowo_suvori_venemazalufav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/024e3be7-ba07-438c-ad4f-ec388e485cf3/fifty_shades_of_grey_author_in_wattpad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33a12c6-eba9-4826-9433-005c27d61a0d/nujaxofilomuripowelagek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e3cffc-7328-43da-870e-eedf9ab816d6/ligisataragodu.pdfIn PDF document text
    • http://koxupukilox.rf.gd/35481260347.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/financial_forecast_model_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/medical_alert_systems_canada_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/67208797903.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/my_cloud_mirror_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c68293a-80d1-458c-a10b-acbb0c50c3d3/how_to_crochet_slippers_for_beginners_step_by_step.pdfIn PDF document text
    • http://kemopix.rf.gd/winnie_the_pooh_latin.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/zebesidotolovez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7f4873-2e93-4d96-a5ea-80fa5f251ada/was_shakespeares_macbeth_a_real_person.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 5108 bytes
SHA-256: b5c0b3674b13e1fd1f9dd463ee2e64bff9adb0b577a0931eaaac5f096b2123ab
font_01_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 9920 bytes
SHA-256: 5a47d98c925c54dddbf57679e3f3c1cae14a603e8f37cc50eecc6c652cdba55d