Malicious PDF — malware analysis report

Static analysis result for SHA-256 c361b3a8af7d137c…

MALICIOUS

PDF

33.8 KB Created: 2020-06-06 06:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e65301adecba4483d8101c1fefd9a9c5 SHA-1: 8bad0844e6644fb7d27e8dab11777bbeb64ccc82 SHA-256: c361b3a8af7d137c399f3e6ba9c4341a4a5c266c241af5b9903c0ad506dfc67c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on unrelated domains. The document body, though partially corrupted, also contains some of these URLs. This suggests a link farm or SEO poisoning attack, where the goal is to drive traffic to these external resources, potentially for malicious purposes. No scripts were extracted from this sample.

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://rothesaymotel.craiglang.ca/uploads/1/3/0/6/130621831/130621831.html#writing+sine+and+cosine+equations+from+graphs+worksheet
    • http://jsaenterprises.com/uploads/1/3/0/5/130543190/lunebubakaxofeb.pdf
    • http://hangsuitenetwork.com/uploads/1/3/0/7/130775762/xexexi.pdf
    • http://alpharcg.com/uploads/1/3/0/7/130775911/4e8b80f.pdf
    • http://arevolutionstudio.com/uploads/1/3/1/4/131407558/ruvixaxasovifulakap.pdf
    • http://xn--hferlininstitut-8sb.ch/uploads/1/3/1/3/131383416/lumarini.pdf
    • http://kellysouthernwoodcrafts.com/uploads/1/3/1/4/131406510/4fcd672b373d2.pdf
    • http://mjbfilms.com/uploads/1/3/1/8/131857602/6f869.pdf
    • http://wickedslushukiah.com/uploads/1/3/0/4/130475959/bizixofe.pdf
    • http://nebraskachambers.org/uploads/1/3/0/3/130313582/84f6a7.pdf
    • http://rothesaymotel.craiglang.ca/uploads/1/3/0/6/130621831/terms.html
    • http://rothesaymotel.craiglang.ca/uploads/1/3/0/6/130621831/dmca.html
    • http://rothesaymotel.craiglang.ca/uploads/1/3/0/6/130621831/policy.html
    • https://lonejimi.files.wordpress.com/2020/06/13047665507.pdf
    • https://fewerosoxog54039784.files.wordpress.com/2020/06/63603177509.pdf
    • https://dunawudawoma.files.wordpress.com/2020/06/ruratotabigob.pdf
    • https://veloxagudop.files.wordpress.com/2020/06/38668654519.pdf
    • https://visovitabo.files.wordpress.com/2020/06/497514057.pdf
    • https://pumopegebar.files.wordpress.com/2020/06/muteliwaveninaz.pdf
    • https://zasolifi.files.wordpress.com/2020/06/wafujitabibavijelutojafa.pdf
    • https://goxiwafiwavi.files.wordpress.com/2020/06/96297514221.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_off000058cd.bin
2806614210334623ac30eb2db5281a31ff692da3ed4841d6434fd34bb17c85aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x58CD 9900 bytes