Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cc3f0d6318ef20…

MALICIOUS

PDF

79.9 KB Created: 2021-03-30 13:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b0dfbd4b4bcb83ec32b6aeed0cb49be9 SHA-1: 3e927f73c4364ed0e868b2e41af3e6e945a92e85 SHA-256: b0cc3f0d6318ef20351175e302509c4bc6caeffef116a542e503600851f0f267
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to drive traffic to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or link-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://dugedepap.ru/award?keyword=adjective+order+english+pdf PDF link annotation
    • http://davebamonuzove.medianewsonline.com/socrates_philosopher_in_urdu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_5fce76f419c7e.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/gujasaposusakin.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/7gcgfGx/32913125900.pdfIn PDF document text
    • https://bawoxuvebi.weebly.com/uploads/1/3/4/8/134886771/3102616.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fce8a6a0cb78.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/NiaN7jj/messenger_app_icon_black.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/kuvene_kudigo_xulivebisipux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421768/normal_5fd243240f2c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_604460c10dbb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kidagemomosate.epizy.com/72556537918.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/fema_ics_700a_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/acid_bases_phet_weblab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/27797784863.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/flight_of_the_bumblebee_clarinet_and_piano.pdfIn PDF document text
    • http://jatuxijor.epizy.com/visual_studio_2017_crystal_reports_designer.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/tratamiento_ataxia_cerebelosa.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/lerok.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_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 5332 bytes
SHA-256: 59c871ae25567f581b3e6af7dc6bb90f8536af007d70ea2a4ed3f49476549a01
font_01_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 10884 bytes
SHA-256: ea9c81d93873ccce5e4ccb8d9cfd07f06bc7a69af361cbe54a104c0399acd2fd

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