Malicious PDF — malware analysis report

Static analysis result for SHA-256 35757f6261169818…

MALICIOUS

PDF

39.6 KB Created: 2020-03-14 19:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ca817c66a1ba1460a220a849e45ea6f SHA-1: 218683e41f155658c940960344e8de1f2435d354 SHA-256: 35757f62611698188143579778f3ca3f14e50d0c895b999f6802132a0d461934
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating a likely attempt to lure users to download further content or provide sensitive information. The embedded URL 'http://yvzsr.bpmtc.com/uploads/1/3/0/8/130874104/130874110.html#gonna+fly+now+piano+sheets' further supports this, disguised as piano sheet music. No scripts were extracted, but the extensive link farm and ML classification strongly suggest malicious intent.

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://yvzsr.bpmtc.com/uploads/1/3/0/8/130874110/130874110.html#gonna+fly+now+piano+sheets
    • http://www.einstruction.nl/uploads/1/3/0/8/130815192/5234719.pdf
    • http://shamkafinc.com/uploads/1/3/0/2/130270872/7694106.pdf
    • http://tietzepark.com/uploads/1/3/0/3/130379138/dojinidedugetuse.pdf
    • http://mondz.com/uploads/1/3/0/4/130477533/weguso.pdf
    • http://verticesglobals.com/uploads/1/3/0/7/130738979/xoxiteviku.pdf
    • http://1electrical.com/uploads/1/3/0/4/130476573/nizon-juzonu.pdf
    • http://heartlandjoy.com/uploads/1/3/0/4/130435927/3323658.pdf
    • http://monsterhoops.com/uploads/1/3/0/8/130874104/katajo_kelili_zizufiseg_joneduxotal.pdf
    • http://feedomrings.com/uploads/1/3/0/7/130776265/b9e14f601.pdf
    • http://mightyjunior.com/uploads/1/3/0/5/130539251/7283549.pdf
    • http://goodfoodfilm.com/uploads/1/3/0/7/130775217/9027731.pdf
    • http://astepahead-daycare.com/uploads/1/3/0/4/130435582/wakiluvu-redumixazolukun-wogekapeguzuvub.pdf
    • http://drakonianarkanum.com/uploads/1/3/0/5/130540472/7327277.pdf
    • http://goodstewardsofrockingham.org/uploads/1/3/0/8/130813652/3095991.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_off00006efe.bin
d60f6436ad5571c81e32616393f113254306f1046272de00c0f577990ea0024e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFE 9196 bytes

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