Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c43decae475fed…

MALICIOUS

PDF

85.0 KB Created: 2021-03-25 01:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7ff93a8f99a682b2632e4816bf334901 SHA-1: 5826a990617fe51e90ffe9dcbede1b9701c6c77a SHA-256: c7c43decae475fed7b1a55b4823a7037e0cab129fb2b769f75030e4551f21c17
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to 'https://zajinet.ru/award?keyword=synonyms+and+antonyms+esl+pdf'. This URL suggests a lure to a website that might host phishing content or further malicious payloads. The presence of a large number of external links, including a 'link farm' heuristic, indicates a potential SEO poisoning or spamming tactic. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://zajinet.ru/award?keyword=synonyms+and+antonyms+esl+pdf PDF link annotation
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/wifarevewu_dunoworerona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_6030807a49e9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5fd065c86efde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_604b044e2fe9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5fc5fbb7cd2a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476301/normal_60018087c7f08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fe41f017f01e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_602f5236e4f07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_6000241090e36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fc7d6325c942.pdfIn PDF document text
    • https://basexexax.weebly.com/uploads/1/3/4/3/134308464/6872f8bd53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_6028aa79848d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5ff8812bacb46.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/jeromisixinolib/53720114592.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/gowawutovivaladasizoxug.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/38837020921.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/17719474085.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/4985271458.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/avatar_musik_hack_apk_0._8._0.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/youth_basketball_offense_against_a_2-3_zone_defense.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/jopiza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 5296 bytes
SHA-256: ce95981c748bb858e10d82877a9b9383ba8dd803b3d53957670a27195ba69a4b
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 11736 bytes
SHA-256: a46574d2c12697073522bf5fa7dab743971a40f47e6f9010157e3a23be1c63b0
font_02_sfnt_off000130c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C8 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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