Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c12300f27524cb…

MALICIOUS

PDF

91.9 KB Created: 2020-12-23 16:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 89adc5577671cf7859b680a1a135deb5 SHA-1: 9b096a5f14d378ecda2e67c35c629960a9fd75e1 SHA-256: 13c12300f27524cbb3a9fc7e95559db604b271e8b743b8fcf5b1cb154c89ddc4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which point to other PDFs, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The document's content, though heavily obfuscated, appears to be a lure related to free software, aligning with phishing or malware distribution tactics.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafficel.ru/aws?utm_term=dead+cells+pc++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469128/normal_5fa60f0512a1c.pdfIn PDF document text
    • https://cdn.sqhk.co/gifitebona/mibgdPB/piwomemuduvubo.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/ciehijf/xazudoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/7hc1gie/gba_emulator_android_no_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/fhahgyL/lurezibufogoloso.pdfIn PDF document text
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/e39079e47e35.pdfIn PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/lageg_kivewepifed_sujaginixij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fb73e2fdacac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5f99e7dd76d88.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/xogeligu_bevakozus_dizasebikafir_tevifixidijalot.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/jXgehh6/4122783602.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/877874ff-01f2-4494-a555-d0096925fd17/aprilaire_humidifier_installation_manual_600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7627d46b-a5c4-49c5-9285-a051cca81a25/street_fighter_4_full_character_list.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_off000129c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C4 5148 bytes
SHA-256: 0aa239dab4aac34781fa79d9473f644479c887d9369a1bf66b1accd163f45d60
font_01_sfnt_off00013b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5D 11768 bytes
SHA-256: 2ff2182fb5c9548e48e4851a8ae61885f9a574db531d651eb23c633fb3dd6239

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