Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed4b24406165f29…

MALICIOUS

PDF

33.1 KB Created: 2020-04-03 01:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 2ec62165b4f3e1fa51931a14ec5e5f96 SHA-1: 7d1182a076ff66ac4f8ab633356dab3fbadf16f1 SHA-256: fed4b24406165f2905fdce0f7346363bf716b38467451200dbd92ca556b3c27c
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to 'Alabama state of emergency 2019' and embedded URLs, suggesting a lure to external content. The ML classifier strongly indicates maliciousness. The primary attack pattern appears to be a link farm designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://greenriverpostinc.com/uploads/1/3/0/9/130969179/130969179.html#alabama+state+of+emergency+2019 PDF link annotation
    • http://teachntech.com/uploads/1/3/0/6/130639641/99c1cf9.pdfIn PDF document text
    • http://newcanaanlakesidechateau.com/uploads/1/3/0/5/130589137/3504982.pdfIn PDF document text
    • http://the-woodleigh-residences-bidadari.com/uploads/1/3/1/3/131380582/4469658.pdfIn PDF document text
    • http://bransfordmedpsych.com/uploads/1/3/0/7/130739107/d044cb62037.pdfIn PDF document text
    • http://fc-f�ssen.de/uploads/1/3/0/6/130621004/7698523.pdfIn PDF document text
    • http://cathybetoin.com/uploads/1/3/0/5/130544591/fanusow_wuwaw_widuzazopu_wimosiraka.pdfIn PDF document text
    • http://alplatocpadmore.com/uploads/1/3/0/6/130620575/8722267.pdfIn PDF document text
    • http://izapped.com/uploads/1/3/0/4/130476410/9065381.pdfIn PDF document text
    • http://bryan-ortega.com/uploads/1/3/0/8/130873872/gitexazig-tirizabodawi-pozidite-tolulisab.pdfIn PDF document text
    • http://rabungamebirdsandhuntingservices.com/uploads/1/3/0/4/130489343/d9d0d.pdfIn PDF document text
    • http://camidogtraining.com/uploads/1/3/0/3/130323755/7464311.pdfIn PDF document text
    • http://xn--fc-fssen-95a.de/uploads/1/3/0/6/130621004/7698523.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1A 7280 bytes
SHA-256: 524662778e9ea3c58f3b593c576ad677736a9c428152af04973a0ef96fdc5d6f

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