Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc83cdb5d594aa1d…

MALICIOUS

PDF

77.9 KB Created: 2021-06-03 01:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aeb5d2a661cbbf9a6c7c1d0a27a1d19d SHA-1: 963fea333d6b596b19894b264df9433560d1b692 SHA-256: dc83cdb5d594aa1de03957bb6f9df90e4a91b2b1a55c23c6aa5ffe306717745b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://inwebjor.ru/pbw?utm_term=teoryang+sosyolohikal+kahulugan+at+halimbawa, which is likely used to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=teoryang+sosyolohikal+kahulugan+at+halimbawa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489981/normal_6034eab7a151d.pdfIn PDF document text
    • https://gibegijatu.weebly.com/uploads/1/3/5/4/135400332/2a46fa894fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448323/normal_6035520771b7c.pdfIn PDF document text
    • https://nebavorod.weebly.com/uploads/1/3/1/4/131406600/22df42d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_6054c0c63ae4a.pdfIn PDF document text
    • https://widawukilifuduz.weebly.com/uploads/1/3/5/3/135398171/3326261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_6011aa2e35dc0.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/50768d0b-53aa-45ff-ab06-2d20dbc19068/what_medals_do_usmc_reservists_get.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144463959/kokubusopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a5c844-4227-4142-927b-dbc5180fc684/95348399871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05923ba7-37c7-47c8-b47c-c6634ed1fe61/bodilamej.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427695/wozujepiduvumup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491d4924-4732-4f5f-ac92-42e708bcb6cb/womurulimijazimed.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144442488/learn_to_speak_arabic_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687e7a75-4e56-400c-9d2a-80f614050299/46568554447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cbcbc5-f9b4-4216-a0a9-9d8ff65e8a04/jane_jacobs_eyes_on_the_street_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ccad24f-61e9-4b6c-882a-21fea7a00418/english_for_beginners_online_test.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144527952/mcgraw_hill_my_math_grade_3_volume_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c947aae-a66d-4dda-af00-f7469b8e6550/texmo_taro_submersible_pumps_catalogue.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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 5444 bytes
SHA-256: 232fa7eabd92c2cadadd3faac3ef21dd74a638e86d8bd02684b23e982c400495
font_01_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 10976 bytes
SHA-256: d13267e1d3dd2d0d1933d9ca571f41bfe61060098a5b781326d5b1579acfd782