Malicious PDF — malware analysis report

Static analysis result for SHA-256 b007b9dc7a471eee…

MALICIOUS

PDF

68.6 KB Created: 2020-11-27 18:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a7e3036b44a5d12b807b5f56f1c1a53 SHA-1: 3d0e2f3982a583e753fdd2043932ba3310942c73 SHA-256: b007b9dc7a471eeea0f5806c124eb99e062b5eb387ce406b68af91dc11009241
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by a ML classifier and ClamAV as malicious phishing content. The embedded URL 'https://trafffi.ru/aws?utm_term=english+speaking+course+app++for+android' suggests a lure related to an English speaking course app, likely to trick users into visiting a malicious site. While no scripts were directly extracted, the PDF structure and external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffi.ru/aws?utm_term=english+speaking+course+app++for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5fad6e33b63d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5faf3ae640618.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/2109233.pdfIn PDF document text
    • https://zebatezovas.weebly.com/uploads/1/3/4/6/134618099/478978511.pdfIn PDF document text
    • https://nesiritu.weebly.com/uploads/1/3/4/6/134612540/8691040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f88b0bceb990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5fc0b227747c6.pdfIn PDF document text
    • https://xipazodi.weebly.com/uploads/1/3/4/3/134375507/4448646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/10954541459.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/jimpson_weeds_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09aa097-cf16-4582-9f11-043b5d38972a/nujegakemozezipafafutag.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_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 5436 bytes
SHA-256: 9452f6aec9b10a3e00608b74553a742f31afd3dca6de28ce83b789269bf59e66
font_01_sfnt_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 10988 bytes
SHA-256: f9012d0968bbbdc3561c9dc84b71632a345de0936f33b14608c8a398d3451c4b

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