Malicious PDF — malware analysis report

Static analysis result for SHA-256 0995b83b975ffd0c…

MALICIOUS

PDF

62.5 KB Created: 2020-04-12 14:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 64e561cda72d25a5667a1b4de28e9af5 SHA-1: c6bf201052c0b256899484aee0a22af92df10b43 SHA-256: 0995b83b975ffd0c8bc6e673817d3e9d82e69514b36118f5ec8b07a3d1ef9ea6
136 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a movie review, likely intended to direct the user to a malicious site. The ML classifier strongly indicates maliciousness, and the PDF structure with numerous external links is a common technique for distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://stopeurocide.com/uploads/1/3/0/9/130969971/130969971.html#no+longer+human+movie+review
    • http://indozfestivalbrisbane.com/uploads/1/3/0/3/130312923/c971d67e53d39.pdf
    • http://jbrpartnersinc.com/uploads/1/3/0/7/130775588/7165036.pdf
    • http://j-ab.se/uploads/1/3/0/2/130273872/seromusobozixa_vakewa.pdf
    • http://timelessfabrications.com/uploads/1/3/0/8/130813516/kusuxore.pdf
    • http://ngnmcontracting.ca/uploads/1/3/0/5/130540699/dajixozobol_zikibunitaw_julofanitu_diporux.pdf
    • http://sexandsexualhealth.com/uploads/1/3/0/8/130873741/melanakadesugobemi.pdf
    • http://sagebrush-studio.com/uploads/1/3/1/1/131164293/lupekipugerufevava.pdf
    • http://senukgroup.com/uploads/1/3/0/9/130969684/watox_jexajoxuvav_vaxazixex_lakuj.pdf
    • http://northscottsdalevacationrentals.com/uploads/1/3/0/7/130776247/bukujinunep-vibutemiparifik.pdf
    • http://ethosbeats.com/uploads/1/3/0/6/130604040/4915502.pdf
    • http://internationalmediaconsulting.net/uploads/1/3/0/4/130488924/sugazubumikoxupusi.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009141.bin
6d818c936f520bc187a007aba686265c91f3403e300f6efdc7d13a003e9ee85c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9141 8656 bytes
font_01_sfnt_off0000b198.bin
b2ee8da8d4d7c0b07f219b16fa1962bd67c3a28688193c048942b3ecba4ac93c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 19292 bytes