Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0171c830918c9db…

MALICIOUS

PDF

82.0 KB Created: 2021-02-10 02:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d1b86421161f32b7b59c6bac719388e SHA-1: c69cb6aa0c3094561dd4e2b48bd0f73a15d79f30 SHA-256: a0171c830918c9db58b8f53a9c80487694ab7a7bd1db18a90fea5a2319c930d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://jacksth.ru/aws?utm_term=baxter+elastomeric+pumps+clinician+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472506/normal_5fd3a64c1e59f.pdfIn PDF document text
    • http://just-gopro.com/zirewisuwoa61pe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_601ee54808969.pdfIn PDF document text
    • http://adanakebap.org/ping_pong_toss_game_rulesokvvw.pdfIn PDF document text
    • http://krokoboko3.xyz/escape_the_labyrinth_bookz1e6d.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/xotepokemuzimowof.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/8333628.pdfIn PDF document text
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/7e0feea464d.pdfIn PDF document text
    • http://kushtanash.ru/bodeguttmzcc.pdfIn PDF document text
    • http://techanomic.com/chilly_gonzales_re_introduction_etudeshhqr4.pdfIn PDF document text
    • http://aarbuz.space/fasutuc7pk1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5fce9609d28bf.pdfIn PDF document text
    • https://sixokibikije.weebly.com/uploads/1/3/1/4/131437702/366102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_6020fe0154fa9.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/jusuberu/mixovubukaw.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/resignation_letter_sample_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/xatozuvigudufarawilonimi.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/62717159971.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/manualidades_de_carton_paso_a_paso.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/44771308939.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/bellini_oven_manual_bot608x-_f.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/11857740879.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_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 5512 bytes
SHA-256: 16261274e0101870f549200a0f9792223433289fee6b7bb7c4e9385d30e0b920
font_01_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 11548 bytes
SHA-256: 0190700829c3c8c186cc90e01d9ec05ca6291cbc0d339ca3c43e2d00ca9e0f15

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