Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ca50ef1cbf9381…

MALICIOUS

PDF

83.3 KB Created: 2021-05-27 14:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ddf348258ceb4b25e0e10d4eff25ab23 SHA-1: 29f3c3a7cdccafad085a4c3b5d0529e61d26ba76 SHA-256: 70ca50ef1cbf93819cbd9bc69814b25db0a7d19dba772888b6c1354ee710b315
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The presence of a URL with a 'china visa in singapore' term indicates a lure for users seeking specific information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/strik?utm_term=china+visa+in+singapore PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408707/normal_6028a23ca8846.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/bevumonodabe_butaluzoroxi_rafukuno_lozewadazalebu.pdfIn PDF document text
    • https://xexofudef.weebly.com/uploads/1/3/4/3/134339501/7106401.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/vejured.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_5fec0dc29d866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485703/normal_6002f3da08440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_6044dd2a5297d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_60242eea5d8e8.pdfIn PDF document text
    • https://botebagi.weebly.com/uploads/1/3/4/8/134870763/wateti_fajuzekosajulem_nizok.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/273a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_603614b0cd13e.pdfIn PDF document text
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/zejodaromu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_60505c5a7c07d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490539/normal_6008d02eeb69a.pdfIn PDF document text
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/vedobewewiziroz_saxajo.pdfIn PDF document text
    • https://fasipibopokele.weebly.com/uploads/1/3/6/0/136096953/femuvus-bimixiribor-zabulazovilu-sovubul.pdfIn PDF document text
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/0700036.pdfIn PDF document text
    • https://vawalebadafi.weebly.com/uploads/1/3/4/6/134660315/00fab6df76.pdfIn PDF document text
    • https://wivezinafixozut.weebly.com/uploads/1/3/0/9/130969190/3567787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6021fd0ec2b88.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/2599910.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39b90b1-cebd-4654-aff5-66a8c4f9abd8/dizexigoxigekibamopub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79903883-5dbb-4b9e-b846-84bbfdb510ba/koveravabimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d0cb65-b89b-4fc9-bdb3-ff7958fe5d00/triangle_congruence_proofs_practice_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10484f87-cd78-4b3b-9a46-059c7e70555f/rasamazorowikasen.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_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 5016 bytes
SHA-256: 0508da94e5be0b71b2d7b480dcdd87cb867cb483ac1f2188eb71f22e16b4f781
font_01_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 11640 bytes
SHA-256: 1917746cf4b2c69a43f874a3439339fb5f17e7b8266ae1210a916e280a794848