Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d35e6b1cca6bae…

MALICIOUS

PDF

76.3 KB Created: 2021-06-06 11:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 28f98ca424ba74a314d7259bf6cce0c2 SHA-1: 406472622074061b21afa711c11fae5f59922817 SHA-256: 10d35e6b1cca6bae051204e8bf0a553473689344c3e1b6d640fa3eaca4c5f6c8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and includes a URL with a 'utm_term' parameter suggesting a phishing or spam campaign. ClamAV and an ML classifier identified the file as malicious, specifically a phishing trojan. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/pbw?utm_term=head+soccer+championship+league+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416144/normal_603b66fca3bd3.pdfIn PDF document text
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/3388116.pdfIn PDF document text
    • https://juderesovabivov.weebly.com/uploads/1/3/4/6/134680251/xikimerorowe_tuligidesus.pdfIn PDF document text
    • https://nefavegipu.weebly.com/uploads/1/3/4/3/134365482/lilugo_vigozoxixa.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/4107258.pdfIn PDF document text
    • https://sumadapovememer.weebly.com/uploads/1/3/4/4/134494733/dofapimefavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503214/normal_60263ed367b49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5fcf9a2470dcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456998/normal_6002d70db1432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_6009b85bde626.pdfIn PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/muxekosiju_favavudenotu_nuzojepebozope_gusag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368970/normal_5ff69db495744.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465694/normal_60b3ba9f3b3e6.pdfIn PDF document text
    • https://xijuwubime.weebly.com/uploads/1/3/4/2/134234920/kuzazepag-buriroj-dubawabofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4780970a-76b7-42bd-91a0-087f59bf1182/uci_decision_date_reddit.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/xefilizul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf90269-cda2-41a7-8cf2-0705995d91d6/digital_communications_specialist_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a00a1fa-b507-41af-a634-ef217bf2ce60/33479991006.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/knight_brawl_medieval_battlefield_mod_apk.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/warhammer_codex_vk.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144455724/44903331685.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/47132085588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f56bced-fb28-4f94-a4ef-fbcc1b4d7f7c/how_thick_is_14_gauge_wire_in_mm.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 5456 bytes
SHA-256: 6c3d4cf311f4a654498846c4234b0b853a9b339a0a068e11d668897b21f235eb
font_01_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 10208 bytes
SHA-256: f20ad78822d7bee7f9ec9284654fd7c9ba866878cf71b3f0426396eec0fb456a
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.