Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd22531b0f5781b…

MALICIOUS

PDF

60.7 KB Created: 2020-06-18 11:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0fed7cb25fcbb2eeaa82e3047af5e2e SHA-1: 76874777a17ffb7d50736aabd12e9155af17072d SHA-256: afd22531b0f5781be2814131a76e4dea63bdf7d0c7a366c48843c201237ec01c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms. The document body text is heavily obfuscated and unreadable.

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://warrenbsmith.org/uploads/1/3/0/7/130775384/130775384.html#fixed+orthodontic+appliances+pdf
    • http://ownyourawesomenesscamp.com/uploads/1/3/1/3/131398260/485bac2d9a5.pdf
    • http://kurativehhc.org/uploads/1/3/0/7/130739658/7cdfa7e30fd1aab.pdf
    • http://struckbydesign.com/uploads/1/3/0/6/130604300/d2f19.pdf
    • http://mail.teachenglishstepbystep.com/uploads/1/3/1/6/131637797/besizod.pdf
    • http://arbitrexworkspace.org/uploads/1/3/1/4/131407067/kikij.pdf
    • http://autismeonderzoek.be/uploads/1/3/0/5/130547552/rolija.pdf
    • http://mta.safehavenworship.com/uploads/1/3/0/7/130740492/kuxavanu-kijunezavo-zifab.pdf
    • http://glorythief.net/uploads/1/3/0/6/130639682/kovepopuzufiv_gepar_ninikixage_widuniraw.pdf
    • http://74-123-72-187.mgwnet.com/uploads/1/3/0/4/130476628/filotume_mitev.pdf
    • http://distributedhydro.com/uploads/1/3/0/5/130539049/gafudel_gemuveg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000bae3.bin
f44ac9694356edc21e02a579076644550c7688d1b73f999362cb98cac131f195		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBAE3 25420 bytes
font_00_sfnt_off0000857f.bin
3f98f868242450ce0e937273fa63c08c581a2452425c3dcc62350b0a6ae88232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x857F 5056 bytes
font_01_sfnt_off0000969d.bin
8ce1665b1b09b52517c854edf16262adeaa34c0e6336263ab98825934b81bd2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x969D 10568 bytes

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