Malicious PDF — malware analysis report

Static analysis result for SHA-256 aced8f3d7f793043…

MALICIOUS

PDF

75.7 KB Created: 2021-06-04 06:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab182f9fd403f75943fd2ae3714093a6 SHA-1: dfa7033eb71902c77971501be837650dc4a040ab SHA-256: aced8f3d7f79304379181752547161c273192cf4f52255bec8cf248b269a9235
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDFs hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of a malicious workflow, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/pbw?utm_term=why+use+composite+materials PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380076/normal_606a010af36cb.pdfIn PDF document text
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/70aff28.pdfIn PDF document text
    • https://rupanusevufow.weebly.com/uploads/1/3/1/3/131380126/5935480.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/4185847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_6013ece354e59.pdfIn PDF document text
    • https://vusipesokos.weebly.com/uploads/1/3/4/5/134585271/vudoxevalat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_6060154ebda74.pdfIn PDF document text
    • https://gebulofafilo.weebly.com/uploads/1/3/4/7/134717894/mugofek.pdfIn PDF document text
    • https://fojakejozu.weebly.com/uploads/1/3/2/7/132712415/fozemijasiresaj.pdfIn PDF document text
    • https://tezigawoje.weebly.com/uploads/1/3/1/3/131379443/xofobat_jimejifipituzis.pdfIn PDF document text
    • https://miganavon.weebly.com/uploads/1/3/4/3/134368237/dejaneroxura_nivexexazuxup_rafalitofexitez_sekafov.pdfIn PDF document text
    • https://xuduburuk.weebly.com/uploads/1/3/4/3/134323667/bubonovepepoj.pdfIn PDF document text
    • https://xagajanum.weebly.com/uploads/1/3/4/5/134599721/jedoxeleju_padoteweji_siferak.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4467285/normal_60b1ebc352eed.pdfIn PDF document text
    • https://tezijetukiresu.weebly.com/uploads/1/3/5/3/135394197/b0441ce236.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/fujupag.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/1686565.pdfIn PDF document text
    • https://wugivata.weebly.com/uploads/1/3/4/8/134872137/0e1ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujelupirobe.pbworks.com/f/zozulozudij.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144529629/9223121189.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/how_to_renew_my_passport_online_in_uganda.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/bridge_to_terabithia.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/61501461922.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 5288 bytes
SHA-256: 5812c334c838d6ba303747793089ed2ff62de36c60e0238a6a1ce88c3fdcc0a7
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10736 bytes
SHA-256: ba91d599a6238a67bfa9177f0ffa2028f81dcfc03fdd48973ab4f7ea70092a55