Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df0179541c78f8f…

MALICIOUS

PDF

38.6 KB Created: 2020-04-11 11:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8394c635c1f6a5d75b84b19579c679c2 SHA-1: 03b1e77a2ca39800ea87f060c85da4ff27b74679 SHA-256: 5df0179541c78f8f7443a280d7d84fb1c0d5b02401bf4d00c1ffd4292acef9d1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, a common technique for SEO poisoning or distributing malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous PDF links suggests a coordinated effort to host or redirect to harmful content. The document body, though obfuscated, contains a URL that appears to be part of this link farm.

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://74-123-73-120.mgwnet.com/uploads/1/3/0/8/130814295/130814295.html#san+antonio+silver+stars+tickets
    • http://achieveservicesgroup.com/uploads/1/3/0/6/130640013/kitukulebiloturiregi.pdf
    • http://delarkiltd.com/uploads/1/3/0/2/130270996/sekazejazoj.pdf
    • http://masalacrew.com/uploads/1/3/0/7/130776740/9578172.pdf
    • http://marleyandcophotography.com/uploads/1/3/0/5/130541462/b092805409f.pdf
    • http://theclaytonconnection.com/uploads/1/3/0/6/130604700/688395df38cbf.pdf
    • http://lulustonedance.com/uploads/1/3/1/4/131437012/tevasadugarenogugeko.pdf
    • http://kwikstrike.com/uploads/1/3/0/6/130622038/8781804.pdf
    • http://ojrservices.com/uploads/1/3/1/4/131452922/befilitij.pdf
    • http://guyonrescue.org/uploads/1/3/1/3/131381756/6884396.pdf
    • http://55a212942p6rb.com/uploads/1/3/0/7/130775928/6c4d2638de5.pdf
    • http://spaziozero.org/uploads/1/3/0/9/130969950/49b7b3f.pdf
    • http://robshoerepair.com/uploads/1/3/0/4/130477028/97a8c87f.pdf
    • http://lookingatplants.com/uploads/1/3/1/4/131483343/158656.pdf
    • http://biddendencarsltd.com/uploads/1/3/1/3/131379696/4583028.pdf
    • http://graham-rothschild.com/uploads/1/3/0/5/130588343/zoreviximow-jemuvorirubo-gepufaxopuxet-bodoji.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_off00007031.bin
d763774923485f97c812f479c27b5df0a46f591b7543382ae6da49c2b611b448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7031 7612 bytes

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