Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d589024605c723c…

MALICIOUS

PDF

76.8 KB Created: 2021-01-12 14:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d4e321a8376bfb910304bd6bafec680a SHA-1: 9392163008ef214137d7c842012d149d43f56ff8 SHA-256: 8d589024605c723ccdbe6db8da654597b62a6b46bfe52f10274c9e4a07f7b624
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to formal attire for interviews. The presence of many external PDF links, some of which are benign but others unknown, indicates a link farm strategy, likely to obscure the ultimate malicious destination. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffmen.ru/aws?utm_term=formal+dress+for+interview+in+winter In PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/zaxewema.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/idSmhj5/97283799966.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/807298.pdfIn PDF document text
    • https://site-1178617.mozfiles.com/files/1178617/feriraravos.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/IZVgdhe/petrolia_weather_underground.pdfIn PDF document text
    • https://site-1174313.mozfiles.com/files/1174313/on_the_q__t__crossword_clue_8_letters.pdfIn PDF document text
    • https://kavivafome.weebly.com/uploads/1/3/2/7/132740637/4030493.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/Yjjeihv/kogumovej.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/zuses/anglican_church_reformation_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/fekawinifo.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/boundless_cfc_lite_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/16468303610.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_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 5160 bytes
SHA-256: e5c159476336676f1aefe16d34ac39949eb4fb06a9b33f6528f7b2e3918fcddd
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 10176 bytes
SHA-256: 23c25614db754c4327f9fe05fd955bb2d69a7d5a103dae9cd0f030edceeafbb5

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