Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac440696a130278…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 00:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1767bcede3d2707d7524e85c3d0755f2 SHA-1: 8b44866c53e2382414f6905e0f34a8e411963792 SHA-256: 8ac440696a1302780526ea1209210b9d4ea784a5845e9ad872eb1c4ff841f5fb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to drive traffic or potentially lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • 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://zajinet.ru/award?keyword=solidworks+visualize+2020+tutorial+pdf PDF link annotation
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/9436123.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/hijhhgn/rechargeable_flashlight_walmart_canada.pdfIn PDF document text
    • https://wugexufaferefe.weebly.com/uploads/1/3/0/7/130776446/dogazovuvok_nupulowig.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/jfhaRZm/35202123962.pdfIn PDF document text
    • https://cdn.sqhk.co/nezuxada/GigwRie/hide_and_seek_calgary_neopets.pdfIn PDF document text
    • https://cdn.sqhk.co/nezupusovefi/dhbt1WP/my_talking_tom_mod_apk_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/ichaieb/a_girl_adrift_legendary_fish.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/igBsPih/nuvowidokuz.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/diriburolexazafofimu.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/ruzuwufovejig.pdfIn PDF document text
    • https://cdn.sqhk.co/guwezasov/aggbhgi/ahlstrom_munksjo_de_pere.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/endless_alleluia.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/Fghjdid/78758296919.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/wexur.pdfIn PDF document text
    • https://kumaradogutaf.weebly.com/uploads/1/3/0/7/130775833/7021095.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/b26db62.pdfIn PDF document text
    • http://jajolamuseku.medianewsonline.com/basic_brazilian_portuguese_phrases.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/conversational_english_classes_tampa.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/jazifeporajewijudobes.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/tezuke.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/audiobooks_free_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/does_dunkin_donuts_black_coffee_have_calories.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/patronage_dividends_tax_reform.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/holt_mcdougal_us_history_textbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/buzagebulapowapizefin.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/rekawupetanazofemar.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 5676 bytes
SHA-256: 4f3f71923dc3b15559b6a08f4ea15c87b2b705e5327fde56fca14f0acc0978fc
font_01_sfnt_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 16008 bytes
SHA-256: a549bde18c8663de6a994292d70f014697c46d850a9f25a2ea0d8ca4466de878

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