Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3d889e41304ea6…

MALICIOUS

PDF

81.3 KB Created: 2021-03-24 13:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac8a2a7e59c2774b419a96e0b5f6b1a6 SHA-1: b3176dc3bc75f122e2a55edb7f0556ca89291d20 SHA-256: 8c3d889e41304ea6499254854b0ad10556044a38b069b34c0d3789e4327803cc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://dugedepap.ru/wix?keyword=mabel+wilson+richards+scholarship PDF link annotation
    • https://mugibamarenov.weebly.com/uploads/1/3/4/1/134109107/3301470.pdfIn PDF document text
    • http://prazdnikprosto.ru/adventure_of_jojo_bengali_full_moviemh2ht.pdfIn PDF document text
    • https://wizudagusosok.weebly.com/uploads/1/3/5/3/135317744/fatuluzisakugis.pdfIn PDF document text
    • https://nonujokos.weebly.com/uploads/1/3/0/7/130775252/5df8cb77741fc7.pdfIn PDF document text
    • https://zawobulogu.weebly.com/uploads/1/3/1/0/131070044/wisiworefaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_5fe9343f47551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_6011658f7a159.pdfIn PDF document text
    • http://lodolujin.22web.org/vasajaxorukowuwokawefalut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_5fd13878be04e.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/1e4c0ea76eda.pdfIn PDF document text
    • http://1xbets-regs.site/kamobo6hzqw.pdfIn PDF document text
    • http://copyrightshelpcenter.com/cgnat_mikrotikhcdzj.pdfIn PDF document text
    • http://wirelessinfo.ru/letawojejoluwapuxurahxur1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5fdc9527756a5.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/101c3dc723cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_6049d40646eb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422658/normal_5ff5fc0cc2fe4.pdfIn PDF document text
    • http://xutiwavu.iblogger.org/beckman_oral_motor_exercises.pdfIn PDF document text
    • http://3bki.ru/crochet_pattern_for_childs_hat_with_ear_flapszufc8.pdfIn PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/juvej-tunuvig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_603be4b359030.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
    • http://vefagukolile.epizy.com/md-_datepicker_format_dd-_mm-_yyyy.pdfIn PDF document text
    • http://gabatotudam.rf.gd/toggle_channel_tv_guide.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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 5104 bytes
SHA-256: da6bd31fb8e9beb6534a663c2628a97e6ca57217716eca3684e061c95efb07d0
font_01_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 11548 bytes
SHA-256: a00620ad939fb2a23eb6159a903aad7ae5a4815b45bbc55976d4a9d0cfdd5991
font_02_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230