Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ffef592ae5efc2…

MALICIOUS

PDF

78.3 KB Created: 2021-05-24 03:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a94ee46cc0375a444e348bdaa16dc97d SHA-1: 1e3ea6d8ca9225f96b02803f709b0505f02a59f7 SHA-256: a2ffef592ae5efc2451d0d82b88d5cb07f76630e86f5ea097bb2d24dcc33339b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=minna+no+nihongo+1+pdf+english PDF link annotation
    • https://lugapageragije.weebly.com/uploads/1/3/4/6/134617753/kitubojole_saliwazeletebod_givilalamegap.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/7798219.pdfIn PDF document text
    • https://dugiwisevur.weebly.com/uploads/1/3/1/4/131437249/5435438.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/jobavo/rikop.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/welepakazubawigabomawered.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/counter_strike_game_android_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fadff0e-e0d8-42c0-bf45-da47d33e6b87/vevizak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89eb1489-68a9-4089-84df-ba66485c3a33/the_hiding_place_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a05158-1f5a-49ac-9604-a6d6f73bc0b1/are_apple_books_drm_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/77684248953.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/andis_clipper_blade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/bolenizolux.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/aspersoras_agricolas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3960f806-08de-40ff-ab8e-18d8edee21f3/2012_hyundai_sonata_hybrid_transmission_fluid_type.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/the_hunchback_of_notre_dame_2021_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/ms_office_2019_home_and_business.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/feeling_words_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/920286538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906c4dd7-a7dc-475e-a279-c7a57c215fd2/hec-hms_reference_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f779d3a3-6a8f-4d29-bee4-adb7050a3948/dijonajukebadiwe.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 5264 bytes
SHA-256: 66b9cd94b68f3b8893ac0b3ae8e479e59ccbd7d3ec6f550ae78455458ae78ae7
font_01_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 10996 bytes
SHA-256: d6e2c3265dc3324f15ba858f6c22fc4b24c1e29950d4ed56cab2c7023a9d1e4a
font_02_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10784 bytes
SHA-256: d7157f18cfdda16b3f78b6fca50b31b484975172269b36249055084067c19c2b

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