Malicious PDF — malware analysis report

Static analysis result for SHA-256 6948e861d4b967ed…

MALICIOUS

PDF

83.9 KB Created: 2021-06-15 13:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3e502b8ccd95fa748d512a2b9383499 SHA-1: af4ce7367d396a55c0e06dd6ac29577df43d6eaa SHA-256: 6948e861d4b967ed4fd2c2645c3c592adf02896f51703c3df7e298bbb284edbc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://huntic.ru/pbw?utm_term=virtual+dungeons+and+dragons PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424997/normal_601ca6d1aa95a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5ff37d3a371ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459794/normal_601b3fde4c495.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/2434862.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/xokofexozajeragega.pdfIn PDF document text
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/taguganuruxa.pdfIn PDF document text
    • https://kemodiduwe.weebly.com/uploads/1/3/4/2/134235489/c0e9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_60c314dfa9f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489042/normal_6022c8d874cc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_60322f1b465d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_5fd95fcebe004.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fedc35f00075.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/343a66c7-2ebf-4ccb-97d1-c4e22f9c2619/husky_20_gallon_air_compressor_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/088eb468-8484-4101-9d86-46431fc83e80/nasiroviwiguduxenusixi.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/pakewadesubiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7546519c-fadc-4439-9633-1f7c9afbeb46/penojuzevaluvopozenulop.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/f/68296999140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ed8ab4-c880-4625-88df-32461c019b8c/how_to_determine_the_end_behavior_of_a_polynomial_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13df314d-ba87-4fe5-92bb-cab61757faf9/hirdaramani_group_annual_report_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73665a18-981d-47d1-9b64-6bf102430b58/death_note_movie_ending_explained_reddit.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_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 4960 bytes
SHA-256: 118fe9809b50c5d84cec25ceb1d8bb75a0ada9edbef759ce750ea59f8232f892
font_01_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 11480 bytes
SHA-256: 9aaa013ea464907db066435331c1d6cd3a46400e386664d76b7b3b2c769285de

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