Malicious PDF — malware analysis report

Static analysis result for SHA-256 19394db334353627…

MALICIOUS

PDF

40.6 KB Created: 2020-04-10 14:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 442740f12e6e225c4b577076b04e9d90 SHA-1: 0288f317deffe6abd72445c7ab93da26a84a37af SHA-256: 19394db334353627302eacb07217e22c6049d2c9525886ad0f3d038de6296ba3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links to external PDF files, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. The document body, though heavily obfuscated, contains a fabricated title suggesting a free PDF download, which is a common lure. The ML classifier strongly indicated maliciousness, supporting the interpretation of this as a malicious distribution or SEO spam campaign.

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://guadaluperadiohombrenuevoelfraude.com/uploads/1/3/0/2/130272937/130272937.html#the+human+brain+in+photographs+and+diagrams+4th+edition+pdf+download
    • http://livetruelifecoaching.org/uploads/1/3/0/7/130740492/zopamebevupukaj_migosegogeven_zobunekazojem.pdf
    • http://schemata-game.com/uploads/1/3/1/4/131407424/bakufoti.pdf
    • http://madeformediamarketing.com/uploads/1/3/1/4/131406505/ef509e7c8085d.pdf
    • http://allmybillspaid.com/uploads/1/3/0/4/130475992/afb3ca89.pdf
    • http://rainwildjourneys.com/uploads/1/3/0/4/130489275/zosutuku_mafed_jirupetogusebu_fidizuwukakix.pdf
    • http://bmajorevents.net/uploads/1/3/0/2/130288557/kupiruseg.pdf
    • http://maesttro.com/uploads/1/3/1/4/131408502/4611265.pdf
    • http://masterbuildertexas.com/uploads/1/3/0/3/130323554/38bbc62da.pdf
    • http://km33tulum.com/uploads/1/3/1/1/131164110/4923633.pdf
    • http://parishcup.com/uploads/1/3/0/7/130775009/regotodilapugurijuge.pdf
    • http://trigonhealth.com/uploads/1/3/0/4/130435943/3bea169dc39d.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_off000070c1.bin
40e993a88b456574c9b42ce0ff78602c8c41004b18c07a2d58e4e443b0e9fa46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C1 8976 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.