Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e6d74989c58935…

MALICIOUS

PDF

77.8 KB Created: 2020-11-09 19:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 75cd4b8016df8ea57745f8f4be38d34e SHA-1: 5e6db8bc9c7a4e02c1f4896a0e02eb9d7b891ac7 SHA-256: 11e6d74989c589359b326a6c5eb0443f483cf9896ad2d10938eb13379639f332
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially obfuscated, suggests a lure related to 'reviews on the metabolic factor'. The presence of multiple PDF links, including those hosted on S3 buckets, indicates a potential link farm or distribution mechanism. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?keyword=reviews+on+the+metabolic+factor In PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/bizoseritokegije.pdfIn PDF document text
    • https://faremuxonebaw.weebly.com/uploads/1/3/4/5/134598019/1324928.pdfIn PDF document text
    • https://lisamotakix.weebly.com/uploads/1/3/4/3/134308999/746e6e5a.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/nemafu/57532442272.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/kovikaji.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/43406885859.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/kamawoxel.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/juzozigedawi.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/looking_at_movies_3rd_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/newopetusam/musd_school_calendar_2019_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/56496313572.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/actitud_definicion.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_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 5420 bytes
SHA-256: 884ebf0c33ef184fd468bff18ed5b5640753ffbabe1b3de52ba57d93e8f6709c
font_01_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 10576 bytes
SHA-256: 295069c7eed046b4caa057d970b02de76a5d2affdef4c9372f14654e2da61a5d

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