Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98d59038ff4c6f4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-30 23:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ffa394be345e2776d6cfdbf5c07b8d19 SHA-1: 516a3496c7c6ceb2a4ff7819c50dcfac88ca8f0f SHA-256: a98d59038ff4c6f4c56a86350bb85e871733bdcd6becc511508283414e1862ea
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, many hosted on disposable domains, which is characteristic of SEO link farming. One of the embedded URLs, https://mezovuduw.ru/wix?keyword=molarity+worksheet+%25231+answer+key+chemistry, was flagged by ClamAV as Pdf.Phishing.Trojan, indicating a malicious intent to deceive users. The ML classifier also strongly indicated maliciousness.

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://mezovuduw.ru/wix?keyword=molarity+worksheet+%25231+answer+key+chemistry PDF link annotation
    • http://jerabigemoz.sportsontheweb.net/jevikipo.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/vovan.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/gjajfjb/39365664814.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/cetosis_humana.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/tabaravan.pdfIn PDF document text
    • https://sudomudes.weebly.com/uploads/1/3/0/8/130874284/6509700.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/94514825999.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/ajbjbP4/rawinun.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/jahjuge/wings_of_fire_dragonslayer.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/cYGUATk/1593500725.pdfIn PDF document text
    • https://dunegigamirusa.weebly.com/uploads/1/3/1/4/131437715/2eb06a.pdfIn PDF document text
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/ripowoxubofalotemawa.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/zuroxogamu-gepusise.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/kenneth_cole_reaction_analog_digital_watch_manual.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://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_3217a104f6844ff590bf8e242204a703.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_079e6e8bd63847759577d050e07ac456.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_5312339573ee4d729508ccf8a41a2855.pdf?index=trueIn 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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 4716 bytes
SHA-256: 652b241be2d8deef2c370f8218ae8e46d5b31e672ba5c54795b28940610a7cba
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10520 bytes
SHA-256: 212d5c425b57514c90a89d9a16878ddd94e60039c972749d23da6b89ce8cf881
font_02_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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