Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a40ebf29ad30298…

MALICIOUS

PDF

76.7 KB Created: 2021-03-02 12:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 571a7346e7844107f3a84048aaabed2d SHA-1: 7359ad6544bb851803ed665223ee56ed41799403 SHA-256: 1a40ebf29ad30298cc45eceb221ac9f92c5ea71a68a78edecf3b9e22bb0c3389
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services like weebly.com and sqhk.co, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://leonvi.ru/wix?keyword=xenoverse+2+fighting+pose+k PDF link annotation
    • https://cdn.sqhk.co/xudapurofoz/igehdig/xadadobomibepivo.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/nurokofegebanodisobujole.pdfIn PDF document text
    • https://sagiwotagemo.weebly.com/uploads/1/3/1/8/131871993/buriniwagapa.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/dopilivowelujimivisu.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/ifHjcjj/fitness_bodybuilding_progress.pdfIn PDF document text
    • https://sofirutowik.weebly.com/uploads/1/3/1/3/131381411/1108263.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/rggED7I/6295804409.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/gguezAE/neighbors_federal_credit_union_zachary_la.pdfIn PDF document text
    • https://komidozikozapuf.weebly.com/uploads/1/3/1/4/131455883/natoguduxesut-tekupe-zusexuzuxuwefi.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/eCjghja/hashtags_for_social_media_business.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386605/normal_60046bc173385.pdfIn PDF document text
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/wodezavaka_kitunuvud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_60272aa866869.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/dusilurifavurazitit.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/wubabeped.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/nepogakudaneva-vudulikazew-serowanupivax.pdfIn PDF document text
    • https://tebiwexarug.weebly.com/uploads/1/3/1/3/131380746/kosisodifiguw.pdfIn PDF document text
    • https://vasiwamalag.weebly.com/uploads/1/3/4/0/134012587/sazeda-gejila-lobaram.pdfIn PDF document text
    • https://rokudula.weebly.com/uploads/1/3/4/0/134017654/af6413e2dbe.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
    • 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_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 4940 bytes
SHA-256: f046870d4949e308ab1c912167e20ebcf22c62f4b506e3be5bc7ddf7103cfb60
font_01_sfnt_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 10240 bytes
SHA-256: 80b205b38528417e655462bd64ba551bfe48c96d13cbeb22c688426ee5ee35c7
font_02_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210
font_03_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176