Malicious PDF — malware analysis report

Static analysis result for SHA-256 31155f6b265c2ed4…

MALICIOUS

PDF

100.3 KB Created: 2021-03-15 07:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1c3104fdf7b0fb171760752d9286915b SHA-1: c6a256b4f340cb9977e44eab93451b4952e41f18 SHA-256: 31155f6b265c2ed4667d67d65a55d7e9be45fc385656fcf721af5af761d43bd7
186 Risk Score

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 0.9997

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://dafemum.ru/wix?keyword=osrs+fire+cape+guide+2020 PDF link annotation
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/f07c00285833.pdfIn PDF document text
    • http://trend-sales.fun/jisofopetokepidoxomoturolwi7x.pdfIn PDF document text
    • https://sotipazokelaxat.weebly.com/uploads/1/3/2/7/132712266/88ccefb1a54f.pdfIn PDF document text
    • http://seplafond.xyz/42236605408r381p.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/fujaganeva_filixurod_fupirebibaxu_zifutosilime.pdfIn PDF document text
    • http://profapp.pro/cabinet_ministers_of_india_2019_in_bengalinh3e5.pdfIn PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/sasezibotoja-zufabajejaku-nusifewinara.pdfIn PDF document text
    • http://g2am2e.xyz/some_words_to_describe_sunrise48z63.pdfIn PDF document text
    • http://carluxepaint.site/xokunezetezunugit7phjq.pdfIn PDF document text
    • http://martans.space/ditisuxejalojabunobo71y7a.pdfIn PDF document text
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/41b46912e.pdfIn PDF document text
    • http://vulgargirls.fun/21543703009y6x1k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_31f0ccbb731f483ea05ec395df16ab51.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_f9e3ae3848ea4edbb79f7c5a477d903a.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_e83334f6b89a42a28b87d38d7f417899.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_904691417b8a4acfba01aea275430205.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_2a89865402d94d0b92954deb327cbc80.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7C 5592 bytes
SHA-256: 73ca7062b218ff87574d5d6cf7973a24aaf183eac149afb86c1749a5758e622e
font_01_sfnt_off00015e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E96 11052 bytes
SHA-256: 4b5af8d5e30406ea84839a3736e68b29b452fb8c004c8c5a4f43d7be1a62b4ef

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