Malicious PDF — malware analysis report

Static analysis result for SHA-256 479c03562707be60…

MALICIOUS

PDF

76.3 KB Created: 2021-02-19 06:34:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 10ef0d3c9092441ff408dc296cf2d62d SHA-1: 438dde02c75898d52f933bb95a0c7579d702bf68 SHA-256: 479c03562707be604e4bfa29c584f79c8e7d123986e955e74ed395208f75ed5c
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/aws?utm_term=math+challenge+questions+and+answers+for+grade+5 PDF link annotation
    • https://cdn.sqhk.co/tiwefuxab/Eym6Khb/zowex.pdfIn PDF document text
    • https://rovisudaguxu.weebly.com/uploads/1/3/1/4/131438800/welivilofeved-manuk.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/eujcfg9/alarm_clock_download_windows_8.pdfIn PDF document text
    • https://nirusiji.weebly.com/uploads/1/3/1/4/131407521/2102083.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/gjjhjjh/94913868552.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/jMhdkfO/dragon_wars_d-_war_2007_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_601b636d900ab.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/aihLwYD/adt_pulse_canada_login_portal.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/jhUjagg/mitobevoponew.pdfIn PDF document text
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/rozatu_lanogisizi_jifad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426695/normal_5fe22ad298f0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5ffbc1f12e8d4.pdfIn PDF document text
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/vifigikebo-sanusotekiriz-dexixe-sitegixuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/jh6ghif/football_predictions_nfl_week_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480145/normal_5fcae75482cec.pdfIn PDF document text
    • https://mewarikubunaku.weebly.com/uploads/1/3/1/6/131637951/b805d726e9f7.pdfIn PDF document text
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/butobuti.pdfIn PDF document text
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/bilarupuxujime.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/hziiSs9/watch_live_stream_nfl_games_free.pdfIn PDF document text
    • https://turudesufexo.weebly.com/uploads/1/3/4/1/134131379/fitojel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5fc654eb195b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_5fe6a590151e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 5632 bytes
SHA-256: eea0744968a40b4bc6b992c8b1a91cf46b1ee22f0107d9dea86683bdcb745f88
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 11136 bytes
SHA-256: 78a9e232f5b805e823cfb233d87fa0cad9756ec5712c79c0a918a3fb8c81b30e