Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e75f2d393fb250…

MALICIOUS

PDF

40.8 KB Created: 2020-05-23 21:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcbb2ff060f6a5409d5914db0a9e6707 SHA-1: ecb4ec01e69c2ba964f6976a8be529d449fc2377 SHA-256: 50e75f2d393fb250e4da6de7f3bbe6d543d5a95b1ddaa86767340eaff2687da7
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to the URLs, suggesting a deliberate attempt to create a link farm. This pattern is often used to manipulate search engine rankings or to distribute malicious payloads via the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://s5xpv.bpmtc.com/uploads/1/3/0/5/130539820/130539820.html#taille+de+pommier+pour+les+nuls
    • http://lunarescape.net/uploads/1/3/1/1/131163705/4add9.pdf
    • http://junli2483.com/uploads/1/3/0/3/130379246/13ed84ac147f42.pdf
    • http://conflictresolutionnw.com/uploads/1/3/1/4/131453018/cd13f3b527b3f63.pdf
    • http://pomocdrogowa-przyczepy.pl/uploads/1/3/0/3/130379814/beb35.pdf
    • http://btvproperty.com/uploads/1/3/0/7/130775154/tikikimowa.pdf
    • http://thaispicedining.com/uploads/1/3/1/4/131409170/panovalotigag_muvivagal_dudid_butarifip.pdf
    • http://webmail.theshapesmithbrisbane.com/uploads/1/3/0/6/130620163/23ceaccedae6c1.pdf
    • http://haverstickassociates.net/uploads/1/3/1/3/131383933/viwodagarawem.pdf
    • http://atlwomentowomen.com/uploads/1/3/1/1/131164471/6788491.pdf
    • http://crispandsmooth.com/uploads/1/3/1/4/131483018/6800884.pdf
    • http://tawndabrownteaching.com/uploads/1/3/1/6/131636725/fogefe-paxenebitedabag-kogawi-nilur.pdf
    • http://igotcardid.com/uploads/1/3/1/4/131453561/wesuza.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_off00006f0c.bin
5f27596e917c0495d37332856d620ddd0d37e7de51a03a919729ddc8facacd7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0C 13140 bytes

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