Malicious PDF — malware analysis report

Static analysis result for SHA-256 1330ec6be22c5ea0…

MALICIOUS

PDF

110.8 KB Created: 2021-01-31 01:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ff8806a6b9a5988f03b7b5cb884525a9 SHA-1: b6a69a0344bc2f6df168e0e051c669dd512df18d SHA-256: 1330ec6be22c5ea0f1c5d0dcbede119d608f032b9c3ab5c165cadd461e7231eb
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, forming a link farm. Several heuristics indicate these links point to malicious redirectors and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict.

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://yafferge.ru/aws?utm_term=swgoh+c3p0+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_5fdb4054ba787.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/rusuvaguju.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/jcgeCgd/33823781957.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/3868760.pdfIn PDF document text
    • http://dutov.org/challenger_foosball_tablet5fe1.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/gik2jbg/18882484225.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/eSphaZt/79144149552.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/eKijzig/nikon_70-_300mm_vr_lens_review.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/3250277.pdfIn PDF document text
    • http://prizinsta365.site/8193602714ir7rx.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/IhejhrR/fuvosovewenumodobowasavoz.pdfIn PDF document text
    • http://prod-fruit.space/leet_servers_list02c0u.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/zepoponozojarebuf.pdfIn PDF document text
    • http://relax35.ru/pezufejokordb5.pdfIn PDF document text
    • http://nicechange.space/nosimenaxukifo0nv1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_6015e5292d9cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5fec145b299e9.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/ijicjgc/angry_birds_friends_level_60.pdfIn PDF document text
    • https://xebubezapabiw.weebly.com/uploads/1/3/5/3/135327697/c711f9a6.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AD 5756 bytes
SHA-256: 993872ccbf192c54b18985c8b8a1f084b5e59f7a49ad6cb43b265a17d8f127bf
font_01_sfnt_off00015aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA3 5320 bytes
SHA-256: 6f612f69a39fb5ed052eb30ca9599ad78b0fd9c09991c910f4271b8c40140bc7
font_02_sfnt_off00016cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDA 12792 bytes
SHA-256: 6d591a16071382d982feaf63073d2487b8c714b6dd45d19278c56f7c7786876f
font_03_sfnt_off000197d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197D4 16168 bytes
SHA-256: b2ac67756ccb9a38f0303b1ba820cb5c8b4ab6133599e7fd07ad9e712984a954