Malicious PDF — malware analysis report

Static analysis result for SHA-256 34dff0ec531ba480…

MALICIOUS

PDF

72.8 KB Created: 2021-03-28 11:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fc4955587b6689c55490a1b0677f016b SHA-1: 0efcfaad1b8120ee352cba704ca6a4d5c67fdd28 SHA-256: 34dff0ec531ba480a349c9e765bfc3ce74b26b64102688b8721d02b65c638cd6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text suggesting it's a lure for "Java windows 7 32 bit free", likely to trick users into clicking embedded links. The presence of numerous external URIs, including one pointing to druttle.ru, suggests the document is part of a link farm designed to redirect users to malicious content or phishing sites.

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 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://druttle.ru/123?utm_term=java+windows+7+32+bit+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fc6723ec297b.pdfIn PDF document text
    • http://namsinc.info/ingenuity_travel_swing_weight_limitk2k0o.pdfIn PDF document text
    • http://autobuff.xyz/livipo6p0sb.pdfIn PDF document text
    • http://white-x.fun/gokodivojunalujujerasezizmqv3c.pdfIn PDF document text
    • http://4338bacchus.com/how_to_find_private_pictures_on_android6uijp.pdfIn PDF document text
    • https://xexijawabipej.weebly.com/uploads/1/3/4/3/134317257/toboduva.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://zowomotoridaxa.weebly.com/uploads/1/3/1/4/131438570/3725525.pdfIn PDF document text
    • https://lerofiputa.weebly.com/uploads/1/3/4/3/134367001/2608731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_602c7248db939.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/pafexegud/gevexadilelaga.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/schizophrenia_treatment_guidelines_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/36640865200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252faf6b-613e-4476-a307-b8ca68b5cc29/john_deere_410_backhoe_for_sale_in_california.pdfIn PDF document text
    • http://magivaxinel.rf.gd/zonalekabevazinixevotura.pdfIn PDF document text
    • http://ladorum.epizy.com/27081569245.pdfIn PDF document text
    • http://leporib.epizy.com/xevatukigufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b558f80-080f-4601-82e2-1535f7fd5b18/furanixazof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89129bf7-0a7d-48f0-abd5-c0ae5f71c265/lipinifuxavum.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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 5524 bytes
SHA-256: 3b278ca034c80abd491799faae3df4974a5c1c7138a110c139e6a275091ae0d7
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10712 bytes
SHA-256: b5a894cdd3c579641e4a2e74a47c425b5c46148e80b5d35c39c137a969dca860

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