Malicious PDF — malware analysis report

Static analysis result for SHA-256 a574827ec55ce833…

MALICIOUS

PDF

72.9 KB Created: 2021-06-02 03:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 86d4db71d93348395ebc478e71581344 SHA-1: 764440f0222137d53e4a069d9c010d5d88f971c2 SHA-256: a574827ec55ce83312c034f49a697ad2e7c184d4f03f7b94057730c34f59e2fd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

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://queure.ru/pbw?utm_term=lego+halo+pelican+dropship+instructions PDF link annotation
    • https://rofipufexorijol.weebly.com/uploads/1/3/4/6/134656377/a77a5a062.pdfIn PDF document text
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/lakejomukolekokig.pdfIn PDF document text
    • https://gugukipibedi.weebly.com/uploads/1/3/1/4/131438190/6e5fc7f1a.pdfIn PDF document text
    • https://xelemurefitarag.weebly.com/uploads/1/3/4/6/134601467/povabujobigusurus.pdfIn PDF document text
    • https://lunilipop.weebly.com/uploads/1/3/4/7/134745285/dabojowobaraveb-rebotumip-midisafifim.pdfIn PDF document text
    • https://velupilarase.weebly.com/uploads/1/3/5/3/135341581/sofelodol_muxesuge.pdfIn PDF document text
    • https://rigopodi.weebly.com/uploads/1/3/4/3/134307943/xogitulewusogi.pdfIn PDF document text
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/6914598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144412410/81883983322.pdfIn PDF document text
    • http://mukonisu.pbworks.com/f/kujoretigixibesorelan.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144484020/22206455879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7daeb2-d631-4795-a6fc-2259cd05268b/what_does_god_say_when_you_feel_alone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed6162d-5bfd-451d-bd85-11996ba1258b/67909889022.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144460722/81318807943.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144470853/whats_the_best_exercise_to_lose_weight_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffed12a-e94a-4619-966d-4072e91ebb69/zakuroxuj.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144417942/games_like_clash_of_clans_for_pc_offline_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e2a45a-7c14-44a5-8fc6-6467abfadc17/72265067480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c5f757-e51b-4add-ae89-5de0ff94e941/insinkerator_777ss_install_instructions.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/doforepilanenogopa.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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 5276 bytes
SHA-256: f413d952a86c40b4082b6c8354bf573946173ce5c5cf6b3ef5c680d4a8c18102
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 11676 bytes
SHA-256: 334d3fdb0eab3739a1cae1c350b6f3c9e428301e8cd079d11300fc5d7d4177e7