Malicious PDF — malware analysis report

Static analysis result for SHA-256 18db05e0ce8b7d61…

MALICIOUS

PDF

79.2 KB Created: 2021-04-03 03:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbe6e9ec97361d18817a9d1827de6d02 SHA-1: d6ee5490a20bb15dd3761d777615650292aa99ac SHA-256: 18db05e0ce8b7d613ecd06f236c30a6f21360cfd4aa92fd4e57051f46e711504
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URL pointing to a site offering cracked software. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing lure or malware. No scripts were extracted, but the presence of numerous external links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=truecaller+full+cracked+apk
    • https://cdn-cms.f-static.net/uploads/4413978/normal_5fd0c3bf8fee0.pdf
    • https://fadabavawabup.weebly.com/uploads/1/3/4/0/134095990/4177427.pdf
    • http://xemokajoled.medianewsonline.com/the_economist_magazine_download.pdf
    • http://zedukibawubige.22web.org/31493164833.pdf
    • https://vemifibu.weebly.com/uploads/1/3/4/3/134354414/8faf1e5250b9fc8.pdf
    • https://cdn-cms.f-static.net/uploads/4485569/normal_60519857b1ede.pdf
    • http://fasodotujane.iblogger.org/35920262740.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_6af58d0b06074d9d960715c39fe6b118.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0dd4cf94-3b78-48a1-a668-d5e15ea53c12/92599556397.pdf
    • https://uploads.strikinglycdn.com/files/4da8f296-cdd8-4a6d-942a-fcfa2f9be8ff/kenmore_electric_range_parts_amazon.pdf
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_8fa0955427df4649bd62fd77cf6a9e34.pdf?index=true
    • https://uploads.strikinglycdn.com/files/08b74788-6b0f-4b18-9e2d-99a06d58e494/2524824208.pdf
    • http://vifewupanog.epizy.com/mcgraw_hill_managerial_accounting_chapter_5_answers.pdf
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_b7b510cf1fe24e51b2df93cb77c991ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8b75bbc3-2508-45c9-84ac-6a26266f1522/what_is_the_perfect_a1c_level.pdf
    • http://saxodanokijaj.atwebpages.com/dell_optiplex_760_service_manual.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_off0000ec51.bin
297c3ce1b0a62a05f86fd996fa6ebace0af0f11c583a20fdd93c2486be6d5e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 4984 bytes
font_01_sfnt_off0000fd54.bin
670fad1c3eef21612af4166e26ed7f4c9406eb8fbc0ca6b16267d16850f2c4ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 22636 bytes

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