Malicious PDF — malware analysis report

Static analysis result for SHA-256 0145761661856bcf…

MALICIOUS

PDF

38.3 KB Created: 2020-04-30 02:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7c2170b61fb48b5d45790999785be2b SHA-1: 1338436def288d3a84dcae1e31ae147185e42e23 SHA-256: 0145761661856bcf646398f2eda2dccf01848d1a498967d42f49ed5a686b41f2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, a common tactic for SEO spam or redirecting users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The document body, though heavily obfuscated, contains a URL that aligns with the detected link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://caregivercoalitionsd.com/uploads/1/3/1/4/131406934/131406934.html#physiologie+du+liquide+amniotique+pdf
    • http://reddogquilts.com/uploads/1/3/0/7/130739048/desaf.pdf
    • http://deeplyloved.org/uploads/1/3/0/4/130435717/bizujixa.pdf
    • http://glassmunkeyshop.com/uploads/1/3/1/3/131380485/768243.pdf
    • http://decgallery.com/uploads/1/3/0/7/130775544/c16f17e8434.pdf
    • http://vittskrap.se/uploads/1/3/0/8/130874600/rorokipezitejej_lerogunavawele.pdf
    • http://raulrosasound.com/uploads/1/3/0/6/130604583/porunifadozoxaj_xuwavi_tijul_xabivolise.pdf
    • http://spiritualstylist.com/uploads/1/3/0/9/130970004/667a1.pdf
    • http://ihatechlorhexidine.com/uploads/1/3/0/2/130272853/giduvifofamebiroke.pdf
    • http://angelpractitioners.org/uploads/1/3/1/4/131406669/5030448.pdf
    • http://giftsrwanda.com/uploads/1/3/0/4/130435577/jebivixuxifexaga.pdf
    • http://calligraphy-corner.com/uploads/1/3/0/6/130604984/ridamogoworos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa7.bin
6602f21cfb3abb218fa10516e6e9948566846401a768374a22a026dacfc6026d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA7 9384 bytes

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