Malicious PDF — malware analysis report

Static analysis result for SHA-256 847dcdf910783b4d…

MALICIOUS

PDF

82.0 KB Created: 2021-03-20 23:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 58783dbdb3dacbf38fa2453a752de25b SHA-1: 615292be392587f71b9b9a41d7b7fe3b5e7e6591 SHA-256: 847dcdf910783b4dd2c1141cf1deb3f789cdeff4f47d0381e1e359bdd9816977
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though partially corrupted, indicates a lure related to 'interview questions and answers'. The presence of ClamAV and ML heuristic firings, along with the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM rules, strongly indicates malicious intent. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://xezojetit.ru/123?utm_term=interview+questions+and+answers+for+freshers PDF link annotation
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/4356416.pdfIn PDF document text
    • http://makipoduzoru.22web.org/48146344897.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/jjvieic/11588027680.pdfIn PDF document text
    • http://dusalawolut.iblogger.org/what_is_the_moral_lesson_in_dr._faustus.pdfIn PDF document text
    • https://lukafitujukeme.weebly.com/uploads/1/3/3/9/133997152/gejas.pdfIn PDF document text
    • https://cdn.sqhk.co/zitibidino/iGjh7kV/community_thrift_store_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/hdbUiiC/piano_notes_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/hpOjggf/vshare_for_ios_10._3._3.pdfIn PDF document text
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/de3b02425e2.pdfIn PDF document text
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/fifipojibowilo.pdfIn PDF document text
    • https://jibarekoruw.weebly.com/uploads/1/3/4/4/134445620/futow.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/0q3iZdp/centipede_bite_can_cause_death.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/xiworezemaruralor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6971e23-75b1-4c6c-9dbf-565dc769a450/is_viking_the_best_sewing_machine.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_a4f14ce7cae644b78dbd9bf2f520e4fe.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_1977281d906c4765af33898510ae1ba7.pdf?index=trueIn PDF document text
    • http://gezugazizexizod.epizy.com/idioms_and_phrases_with_meanings_and_examples_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4232f81b-3fed-4978-a236-dbe112c9c987/94125467161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa6da41-c3cb-4add-ade3-c360182ebf2e/what_exercise_can_you_do_to_get_rid_of_flabby_arms.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_b18d2add8f0a42ee8980412f73ad5492.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c9667f-ac55-4e4a-8d83-415e3ba57b8b/94433831976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d16558-360c-47d7-a335-a317451ce2e8/3d_face_mask_bracket_made_in_usa.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_3787b4cb73dd46208ab1df9367ebcb99.pdf?index=trueIn 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_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 5176 bytes
SHA-256: 2f34fe9e284cab5d3e4c2039ab6cc7aba53652ec2467f1b9a6765174246f0bc9
font_01_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 10756 bytes
SHA-256: 0855f7b7e73ba7395ccdb023c6173d2b8d3fb03989eaf2f82b40ef7ed5fd24e2

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