Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3085efffd44f230…

MALICIOUS

PDF

86.0 KB Created: 2021-03-13 16:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b0fc1fcc26654d9833e0322b54441f3 SHA-1: dd1778dc3beb337eb302ae53efdec7c5be07926f SHA-256: c3085efffd44f230eba7b84a995b67d0d67276a9c83bd4ed3d512ceedeed92f1
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting or redirector infrastructure, suggesting a link farm designed to lead users to malicious sites. The presence of a link to a known malicious redirector further supports this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=wwf+coliseum+video In PDF document text
    • http://kamikofonem.mygamesonline.org/colorin_colorado_este_cuento_aun_no_se_ha_acabado_personajes.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/29210533148.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/fomavesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_60155480a15e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_60469dbd35ee6.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/cause_of_diabetes_type_2.pdfIn PDF document text
    • https://korenumotijele.weebly.com/uploads/1/3/4/6/134687452/fc3eb91dfc04c.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/how_to_buy_home_insurance_canada.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/74119367666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_60261a958a3fe.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/wametoborexo.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/fujixi-zizabusijamo.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/jixalenevurinu.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/norina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499622/normal_603c3a3470c6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_29edecd486174d58a1947a27ad932313.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_2427fc2b7b2344e591f01b7421a46910.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_2997a5ae57294f419984c27f17962f2b.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_f2cb1429f9bd45d5be637c6ab66fc2eb.pdf?index=trueIn PDF document text
    • http://bivojeda.atwebpages.com/profilaxia_endocardite_bacteriana.pdfIn PDF document text
    • http://jemileti.atwebpages.com/bank_syllabus_free_download.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_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 5028 bytes
SHA-256: 87e16741974f8e183813a11f846701a27d240b557ed0812a72f98ded207b06a0
font_01_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 10988 bytes
SHA-256: 7e3748aeeb38c3944fbf8ceff996fdb298f41577c54a78d7d93686ef39f63045