Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ccf405f3a96c96…

MALICIOUS

PDF

108.4 KB Created: 2021-01-18 08:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d12896f76242eeef3781ddc0bf66e39b SHA-1: 9dc487b60f5d025dfce5c133be08b64e5f0ea310 SHA-256: 55ccf405f3a96c9634faf8a384565fa94b3494ebe161420c53cc9458cf0a5961
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. This behavior is indicative of a link farm designed to distribute traffic to malicious sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=hydrogenated+vegetable+oil+molecular+formula In PDF document text
    • https://nedovewa.weebly.com/uploads/1/3/5/3/135316636/9382087.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/ligoxeloterewubim.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/xojisarev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f8a2d56b811c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_5fa9a9e610c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5fd33ab6eabb5.pdfIn PDF document text
    • https://bejasesazopo.weebly.com/uploads/1/3/4/5/134512805/3425425.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikalamo/Igfoihl/rockstar_bgm_ringtone_download_mp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411696/normal_5f93388701671.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/e648a77f284.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/gofifupep.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/cif0hhj/light_up_middletown_ky.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476756/normal_5fc5cbde1216c.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/dBBhbha/imfinzi_j_code_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f99b0fd039eb.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/gawuja.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/824ea4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443595/normal_5f9c99b8865c7.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/34c058806171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_5fb80907858b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16568 5424 bytes
SHA-256: 43b4fb2099d5d85acdec4639b658f9a2e63e2f95714561e09ef829ca81b3a334
font_01_sfnt_off000177d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D7 12652 bytes
SHA-256: 5585d30a3303750f028245bfc766f7db8f217b8a73331bc5ff70f5a4ab8bf214