Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b2cd1530bb0a82…

MALICIOUS

PDF

69.6 KB Created: 2020-11-10 09:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8a4a4c9e9d252962717747ea41e9e561 SHA-1: b8ff98f2de65c5e574b2fcc2b3a5c94c3d328cca SHA-256: 76b2cd1530bb0a823529ff4b4b4ebb46136d2dd2a9bd52279d7285929d752ef4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to reference a service manual, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?keyword=dell+inspiron+17+5000+series+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5fa092688be61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f88787e73a93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5f8b31ec3edf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f9d798d195be.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/2b616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5f9570e0768de.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/934cbea5-752a-410e-abe5-57ce6c236c01/nietzsche_superman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0c6636-843c-482b-9d01-640d7fb3524f/sowuseda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a1fd8f-81f4-4aaa-a8f7-a86f80a3d324/resopapirixosuzeragasof.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/gazevatijorazuzipigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac23eab-20e0-4442-b96a-0ce0d8f43538/hampton_bay_windward_ii_ceiling_fan_manual.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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 5536 bytes
SHA-256: c6523a5f0bdffbda7de68d5aedfda0e314cfebbc2c00533ed159dc56f4c5fa57
font_01_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 10028 bytes
SHA-256: f9eb1389f73cfab95101a00e5379015b1602327f1051c38e31f0b01fa3eb24ec

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