Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10864f1dab8449a…

MALICIOUS

PDF

66.0 KB Created: 2021-02-21 05:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d4e36c0b0122fb6e0b9b89f58b9758cd SHA-1: d085fb0465326d32a106b06a8a9811f2afbd6206 SHA-256: d10864f1dab8449aec76bc9f532cc1e6883744657ba30158d3db887fc784f577
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to Weebly and other domains, suggesting a link farm or SEO manipulation tactic. The presence of a PDF_SEO_LINK_FARM heuristic firing and multiple unknown reputation URLs indicates an attempt to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://bologen.ru/wix?keyword=microbiology+tortora+pdf+download PDF link annotation
    • https://dujolisinapujis.weebly.com/uploads/1/3/4/3/134328324/5852060.pdfIn PDF document text
    • https://bonikelebosobi.weebly.com/uploads/1/3/2/8/132814552/tevofoveludal.pdfIn PDF document text
    • https://dasukixarukawo.weebly.com/uploads/1/3/2/8/132814138/9536754.pdfIn PDF document text
    • http://businessmentality.com/kegerobolunavatawujofulrg9sx.pdfIn PDF document text
    • http://creditinquiry.info/sunazigigerifamodowulixob4594o.pdfIn PDF document text
    • http://copyrighytsupport.com/adding_exponents_worksheetrsod3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nunakixuma/guide_michelin_2018_restaurant_lyon.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/47991010449.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/potimejujivore.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/treatment_guidelines_for_diabetes_type_1.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/how_to_take_an_environmental_portrait.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DD 5156 bytes
SHA-256: df4d09f6b929a1bccdde7ba35e2e2c214eeb970c98752f79d3cce6fbba132f3c
font_01_sfnt_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 11512 bytes
SHA-256: bdc3ad19e15fbb5b57a15eb4362f9743947fe7a4ce22bb6bb2b4a998b3a60a99
font_02_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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