Malicious PDF — malware analysis report

Static analysis result for SHA-256 a543b5ef6cbc256f…

MALICIOUS

PDF

81.7 KB Created: 2021-05-30 19:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8869fb09e9fbd410b23324e478763d9b SHA-1: e676452308ab95b6ba5db2a21febf7d8dd88b32c SHA-256: a543b5ef6cbc256fc49bc1a96bd995e9537757e673255374f779ad5eb565e797
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content under the guise of a Minecraft texture pack download. The presence of embedded URLs and the overall structure indicate a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=minecraft+faithful+texture+pack+download+1.15.2
    • https://misekijenag.weebly.com/uploads/1/3/1/3/131380320/lugekowobezuluzav.pdf
    • https://wumupozokowep.weebly.com/uploads/1/3/5/3/135346219/febafaleviranu.pdf
    • https://cdn-cms.f-static.net/uploads/4369645/normal_6023d2832de6b.pdf
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/689a7.pdf
    • https://tusagenitig.weebly.com/uploads/1/3/1/4/131452801/442360d6ce39ee8.pdf
    • https://fulinufifirop.weebly.com/uploads/1/3/4/6/134656376/danogadavevobila.pdf
    • https://static.s123-cdn-static-d.com/uploads/4487424/normal_60b39629319d0.pdf
    • https://static.s123-cdn-static.com/uploads/4448740/normal_60078b0b03f58.pdf
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/9841b2765e.pdf
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/2f4a2878379abd.pdf
    • https://cdn-cms.f-static.net/uploads/4476758/normal_6041af42556ff.pdf
    • https://gilijopagexoda.weebly.com/uploads/1/3/4/7/134713479/tadivawonen-nijujize-dubofetuxoso-wodux.pdf
    • https://cdn-cms.f-static.net/uploads/4414334/normal_5fe653c97c950.pdf
    • https://cdn-cms.f-static.net/uploads/4470696/normal_603ea0c84d465.pdf
    • https://tuzakalo.weebly.com/uploads/1/3/4/4/134492431/1e19d6d5146a8.pdf
    • https://zakupiza.weebly.com/uploads/1/3/5/9/135960967/2d0a150dca.pdf
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd340ad1c57b.pdf
    • https://tuxatijofewimem.weebly.com/uploads/1/3/4/6/134686538/gogebikug_werodaxigom_naperenudagikef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c73d5c6e-8ae2-4eff-9645-ad72d1430d8f/kupagewipodivu.pdf
    • https://uploads.strikinglycdn.com/files/112e6ef3-98b1-458c-855a-df9f81f4fa16/asus_router_default_password_tm-ac1900.pdf
    • https://uploads.strikinglycdn.com/files/e4878a79-4549-4f66-9155-dea96b4add46/37065236780.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d0.bin
d16ff1908c617a88f5c957111bdac2907c5a8fc8cf532571b68efcc4a628e2e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 5516 bytes
font_01_sfnt_off0000faa7.bin
c8b70e96e35d4af66306b24a94516aa99471d2d390d44ceb0f1c413227c8f631
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 14856 bytes
font_02_sfnt_off00012940.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 4324 bytes