Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f19f008cb52712…

MALICIOUS

PDF

86.6 KB Created: 2020-12-17 23:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 85cecd12ce0811303056ee2645e7c178 SHA-1: 4a5ab72fa3892cb63a78a352dccd499cde19a0f6 SHA-256: f8f19f008cb52712079a0087f75d3cbd67689e52bbf894eed1256a17fd812791
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URL 'https://trafffe.ru/123?utm_term=another+word+for+examinee' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://trafffe.ru/123?utm_term=another+word+for+examinee PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f872ccf8dbb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_5fbdc769cd68f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_5fa17cc6f0e3a.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/votosimeriwa.pdfIn PDF document text
    • https://wutawodasigupo.weebly.com/uploads/1/3/4/5/134512212/8306168.pdfIn PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/depuz.pdfIn PDF document text
    • https://votusaponepo.weebly.com/uploads/1/3/4/4/134471583/ruvezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5fd7cff8247c6.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/bofipavarese-ponexax-dodimadakejeva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/spose_good_luck_with_your_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28e9400-1d75-43a0-959a-87b1240e8eb3/21209384310.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/lulowazotumiwirunaj.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/fidinezenak.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7B 4104 bytes
SHA-256: 70cbb1e1fcb9cb2d8086919593f8d7cd44b132a58498a61ea30f2fa7ef5f2b82
font_01_sfnt_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 5088 bytes
SHA-256: ffa168c1b13706c57d4260bc8e20410d50439073458dee18d55effe418ddd438
font_02_sfnt_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 4268 bytes
SHA-256: fa39b081aaa75980670c39ff015a34959398421fd1204d11da563e4b1535666b
font_03_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 4652 bytes
SHA-256: 81ae59d9111ebd83bf31dac1beb1ff54405c9e8a80afc1ea6bf3d29916ab43a9
font_04_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 13956 bytes
SHA-256: ea8edbc0bb75c668f08617e4a0acc4e96e85acfa6cc3bce7cb90c79ea2be78ad
font_05_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16824 bytes
SHA-256: 561ac1bb3470f4b5d62bcdee36de48f0308b83a2b0f6a8c2b721d7f8bd1a7742
font_06_sfnt_off00013d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D80 3212 bytes
SHA-256: 6db11fae749883b6db973abf89d821cd2f6963148f57c89c347698722f1af0e0