Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac17c613a73fe271…

MALICIOUS

PDF

97.6 KB Created: 2021-04-06 04:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3474e6f310be83c6016f7df28ff571f SHA-1: 56be787625155e0dc903bc2fac488dc6d6f57623 SHA-256: ac17c613a73fe271df8598eca96fe61dd8d940c9973261c33c54f33902200d99
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 SEO-optimized, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing trojan. The embedded URL points to a domain associated with distributing potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=caracteristicas+de+los+alcanos+pdf
    • https://cdn-cms.f-static.net/uploads/4386336/normal_603f0ca179108.pdf
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5ff0669cdebc6.pdf
    • https://cdn.sqhk.co/jogekiluse/hhzLVgi/pirate_of_everseas_fandom._com_wiki_weapons.pdf
    • https://cdn-cms.f-static.net/uploads/4451971/normal_6059ed17c62c2.pdf
    • https://cdn-cms.f-static.net/uploads/4465555/normal_605829a08bcf8.pdf
    • https://cdn.sqhk.co/mujekesire/9hbafhb/72155371458.pdf
    • https://cdn-cms.f-static.net/uploads/4485572/normal_6030e55ca7c5e.pdf
    • https://cdn-cms.f-static.net/uploads/4392857/normal_6041fb5d6cf0e.pdf
    • https://cdn.sqhk.co/pamavunawi/bBjeogj/shadow_fight_2_hack_ios_jailbreak.pdf
    • https://cdn-cms.f-static.net/uploads/4418781/normal_6013a3cd337bf.pdf
    • https://cdn.sqhk.co/sitopizol/iAgioRW/meranipatajopumaxo.pdf
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fd3b2ae19df1.pdf
    • https://cdn.sqhk.co/fematixub/Yhhgfhe/fijumute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_d600ab66a38f4896b7d7b556a048e7b7.pdf?index=true
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_b78e5884466a44658dcb02a46b7438c9.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_daccd237c5da4ce4ada9b120c0fa2890.pdf?index=true
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_ee47760c0218423c9d79246c1de09df7.pdf?index=true
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_12ef020cdd254d7f893b8a56aae0a117.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea668a5b-2dbb-48ba-b546-da01cc988839/30684692413.pdf
    • https://uploads.strikinglycdn.com/files/d9f6bc68-f871-4d89-9fbf-2b28a4b21784/does_mtd_make_craftsman_snow_blowers.pdf
    • https://uploads.strikinglycdn.com/files/bdee9925-5bbd-4387-873c-1580be4dfed2/cursos_de_ingles_en_linea_gratis_sep_para_nios.pdf
    • https://uploads.strikinglycdn.com/files/789be2f3-3be1-4150-a53d-5e13f574be71/imdb_odd_thomas_cast.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d86.bin
7fc85202f7d70490884b60e5f304552e6e7fe7d7dc709c27769b56eda0126fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 5052 bytes
font_01_sfnt_off00014ebe.bin
3861d20e064855fc51253910658b5a4327c20b6c267aabd9a5a9f578b448d798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBE 12976 bytes

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