Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c20ba7a94be3d90…

MALICIOUS

PDF

93.8 KB Created: 2021-03-30 23:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d5d9e2cf47f822c3771fa944c1966c3c SHA-1: 63252b48fd4824708e48f336e4713dd3912bfc79 SHA-256: 1c20ba7a94be3d90ee874335483db072849273dac17c08e909903cae8ec2f4b3
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL, https://midufefew.ru/award?keyword=python+programs+using+functions+pdf, suggests a lure to a site that likely hosts further malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://midufefew.ru/award?keyword=python+programs+using+functions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488817/normal_604b3324446c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_601b27943fe61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5fe2fe7a3e7a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_6001aa99d6dc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426571/normal_603165df90f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_6022ceb117497.pdfIn PDF document text
    • http://jezolixepoj.22web.org/balifuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5fcc673a5eafc.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/51929358626.pdfIn PDF document text
    • http://lufusozajufa.22web.org/convertir_en_ingles_al_espaol.pdfIn PDF document text
    • http://tevovarisamoju.22web.org/zuferifo.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/zoromexemuzid/watch_free_barbie_movies_online_without_ing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59669da3-2235-4b64-97a0-6d051650903f/why_is_pokemon_lavender_town_so_creepy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2536d9c3-74d7-4547-aa4c-c95a6a9ea02e/how_to_write_a_legal_opinion_essay.pdfIn PDF document text
    • http://wakurenup.epizy.com/importance_of_self_awareness_in_counselling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c993c64-67ff-412e-9871-bfc1920be665/does_arbys_roast_beef_have_carbs.pdfIn PDF document text
    • http://dalaxawavizaj.rf.gd/arslan_senki_novela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/069e795f-7286-4285-a12d-221e5274e8b6/gufunub.pdfIn PDF document text
    • http://sabaxop.epizy.com/44688694983.pdfIn PDF document text
    • http://zetowimular.rf.gd/42503762799.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/living_with_earth_an_introduction_to_environmental_geology.pdfIn PDF document text
    • http://japivolenalu.epizy.com/amadeus_movie_questions_and_answers.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_off00012dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC2 5640 bytes
SHA-256: edd08785a6d30b32e2bba4c1f9cc4e3aefe2ec7436897dcb422912b93ada795c
font_01_sfnt_off000140d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D7 12116 bytes
SHA-256: b0c16271d73442166bf8341fa075408e7a1258977f8614700e9daa44ca6fdd8d

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