Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c95613654fb875e…

MALICIOUS

PDF

112.1 KB Created: 2021-01-25 12:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 05b60de1e1ad40c5a0db36b3c8ef06de SHA-1: 4de2750df3d89b49344d2aa61b81b62a025e43c8 SHA-256: 2c95613654fb875eb7296e282eb16586a739381a9b501c81ad491a974cab6b7b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=dissolved+oxygen+in+water+ppm PDF link annotation
    • http://fujubipe.22web.org/canada_food_guide_2018_baby.pdfIn PDF document text
    • http://nodozavi.iblogger.org/chale_aana_lyrics_mp4_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_5fd85e6e8e3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5fd320866332b.pdfIn PDF document text
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/lumuxuj.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/e850afdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_6009f7af2fde7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5ffc9d833e2de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_600a41dd0d6d0.pdfIn PDF document text
    • http://zedukibawubige.22web.org/organic_conversions_worksheet.pdfIn PDF document text
    • http://mepanawabopod.22web.org/61086591272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5fdaf929804e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gedexim/sixaxadu.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/92115710040.pdfIn PDF document text
    • http://nazifaba.rf.gd/xopetiwasifaveguwudej.pdfIn PDF document text
    • http://walefusariwe.epizy.com/muzizesamo.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/allegiant_movie_english_subtitles.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001547b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547B 5388 bytes
SHA-256: 3254d595635db1595aa18105fbcc96e5f12002d39a0e951936f2bb4df94b86e1
font_01_sfnt_off000166d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D3 11952 bytes
SHA-256: 09a327de128b94277d44a5b96bf6ae6811955d60dd958c137fb70db8497d0f78
font_02_sfnt_off00018f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F7B 16188 bytes
SHA-256: f556fde67bc11cc16b003e9b57d953562b3481761f4ba7aaa2944500bf0acf23
font_03_sfnt_off0001a4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361