Malicious PDF — malware analysis report

Static analysis result for SHA-256 72173bc2443d551d…

MALICIOUS

PDF

70.1 KB Created: 2021-02-10 08:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 97961fe0dde6026b970994c323d76cae SHA-1: ec7cb48552b6365558e9fd774ea2ca0f8b89192a SHA-256: 72173bc2443d551dd37580ce05f73b5c7028a7245537e427556d70303a59db00
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, appears to contain text related to 'deductive reasoning problems with answers', which is likely a lure to disguise the malicious intent of directing users to numerous external URLs.

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://leonvi.ru/aws?utm_term=deductive+reasoning+problems+with+answers PDF link annotation
    • https://lirurarupo.weebly.com/uploads/1/3/4/7/134770738/belomumipedenegama.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/idiciaK/best_music_ringtones_2019_english.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/ajhyije/vikings_score_yesterday.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/jciggf1/wiguz.pdfIn PDF document text
    • https://zuvaxufar.weebly.com/uploads/1/3/5/9/135993026/0075479e5d9eb80.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/doxod.pdfIn PDF document text
    • http://xuxelenoxuze.iblogger.org/nefatix.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/fHgjgj0/directv_entertainment_package_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/LMjatMM/learn_java_for_android_development_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dosatetirudipu.epizy.com/xijafuzapagotawetu.pdfIn PDF document text
    • http://gegavolaful.epizy.com/gis_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/cheap_thrills_instrumental_ringtone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/70963380023.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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 5776 bytes
SHA-256: 672200264bddf3057ba76e42bcf548f9f9d7a0de289a633be8cfb1642b4721f3
font_01_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 10448 bytes
SHA-256: a67c92887989ea0dc7a505f80502edb10df8a862c6bf3d9b86811886cdb04efd

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