Malicious PDF — malware analysis report

Static analysis result for SHA-256 4500b572c3c00fa7…

MALICIOUS

PDF

85.5 KB Created: 2021-04-20 21:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 79f912089e379104ddc1e3b0cc6c0c99 SHA-1: 9e822de024aa8195e24b013958b907a463f77dc8 SHA-256: 4500b572c3c00fa72d4e0817672dd3e3c465e026e2da289f73185f37815cbada
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one that appears to be part of a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, suggests a lure related to 'body language' to entice users to click on the embedded URLs.

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 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://golowaki.ru/strik?utm_term=can+psychologists+read+body+language PDF link annotation
    • http://rasidafepu.mypressonline.com/47220153402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5fc868f43aca0.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/fewonuxuxuvekozu.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/devuwoxajawiluluwodudenul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_600cbac41a5f1.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://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_b45da25cabfe4bf98da4fded335e027a.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_6279ef6d34d24364935c5cb888f2a38b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/roxolonata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/261348e9-9e24-49c4-9082-9c2edc751a81/52363708998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140d387c-74c8-494d-a11b-e95096211da8/how_do_you_draw_a_simple_dog.pdfIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_8dedcde9e6c0420e914229df66dc7ad0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/persuasive_essay_writing_prompts_for_middle_school_students.pdfIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_d9f8175e1277437b9f7059534d63f61b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/ff14_botanist_gear_guide.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/xinaluvebugilarinapexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7c9ff3-fdcb-4e5a-bdba-585854cf9a49/77856731517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d706782-0fd9-41b5-ab37-1ed5fee710c4/goxuvedigum.pdfIn PDF document text
    • http://xupanapil.epizy.com/international_trade_and_balance_of_payments.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_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 5484 bytes
SHA-256: 62136be379639c90c99c02cd22356099ec791f689f227c17d810cce0d3c074d9
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 10672 bytes
SHA-256: 3d07f3ed2ae1391e29751c0704273670b9ccab1447d22f4580632d2c7176ce91
font_02_sfnt_off00013a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A85 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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