Malicious PDF — malware analysis report

Static analysis result for SHA-256 b735916914e219d3…

MALICIOUS

PDF

33.0 KB Created: 2020-06-03 05:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12b2c5f6cd7ae00d9eb38b8600f32934 SHA-1: 54ff142be2860bb52592a5ef0768fdf0f3492c68 SHA-256: b735916914e219d3e56abc7adfbc5f8e07a338bd2b1f35254768fde19a8fc85e
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 for SEO link farms or to redirect users to malicious content. The document body explicitly mentions 'The amazing spider man apk download', and a primary URL points to a similar HTML file. This suggests the document's purpose is to trick users into downloading potentially malicious APK files by masquerading as a legitimate download link. No scripts were extracted, limiting further analysis of execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mychoicemedicalpractice.com/uploads/1/3/1/8/131857914/131857914.html#the+amazing+spider+man+apk+download
    • http://raw-designz.com/uploads/1/3/0/5/130539408/8187565.pdf
    • http://osullivanloftconversions.com/uploads/1/3/0/6/130604244/vilexumo-totev-kekat.pdf
    • http://rubeenaratcliffe.com/uploads/1/3/0/9/130969141/2575250.pdf
    • http://khareeshorter.com/uploads/1/3/1/0/131070771/bcdf219e.pdf
    • http://mychoicemedicalpractice.com/uploads/1/3/1/8/131857914/terms.html
    • http://mychoicemedicalpractice.com/uploads/1/3/1/8/131857914/dmca.html
    • http://mychoicemedicalpractice.com/uploads/1/3/1/8/131857914/policy.html
    • https://sobudewemed.files.wordpress.com/2020/05/94453224075.pdf
    • https://napipivo.files.wordpress.com/2020/05/laloloputa.pdf
    • https://jakazikosab.files.wordpress.com/2020/05/rawebimosanefusus.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_off0000591c.bin
01d3ad07acceb7f78f5f6dd6bb94c68b07dacfa4bbbb961a3ae7d2ab4120aec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591C 9512 bytes

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