Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b3efa2f28cc0d1…

MALICIOUS

PDF

131.1 KB Created: 2020-05-10 21:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1851fdf378a2eb1f4f54c02184b85e55 SHA-1: 707a3bfb9205662475b7872b2d3f3c90f32d5031 SHA-256: 78b3efa2f28cc0d12e8c68d45434d505455d5e77744769bcb0dc0ad6c105fc60
156 Risk Score

Malware Insights

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

The PDF employs an image-based lure, presenting a screenshot to entice user interaction. Upon clicking, it directs the user to a URL that appears to be part of a link farm, hosting numerous SEO-optimized PDF files across various domains. This pattern is indicative of a phishing or malware distribution campaign aiming to leverage search engine traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 131 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://moldremovalspecialistsredlands.com/uploads/1/3/1/1/131163981/131163981.html#cadillac+escalade+2007+owners+manual+pdf
    • http://unikwities.com/uploads/1/3/0/9/130969748/fujowilalewufubiv.pdf
    • http://aprotestlife.org/uploads/1/3/1/4/131406284/wafozopopebo.pdf
    • http://wellnessundertheoaks.com/uploads/1/3/1/4/131454522/e906437e6.pdf
    • http://fergiebr.com/uploads/1/3/0/4/130477661/josamojab.pdf
    • http://karinmoser.com/uploads/1/3/0/4/130435746/9674737.pdf
    • http://duncanmacmurdy.com/uploads/1/3/0/6/130640175/3839598.pdf
    • http://goldnewmexico.com/uploads/1/3/0/2/130270847/nitosozoda_fufunetuj_zekix_bafujufijubawij.pdf
    • http://graceandainc.com/uploads/1/3/0/5/130588240/1fb769342.pdf
    • http://greengolfcertification.org/uploads/1/3/0/6/130620343/viwivopepivufizo.pdf
    • http://americanmolossus.org/uploads/1/3/0/9/130969837/4f8f58ab162.pdf
    • http://themomma.org/uploads/1/3/1/4/131455956/e28f101b6.pdf
    • http://sawyerhteaching.com/uploads/1/3/0/7/130776022/gomunelagu.pdf
    • http://steverodemsconsulting.com/uploads/1/3/1/4/131437295/dacdcb936a2f.pdf
    • http://shesaknockout.com/uploads/1/3/0/6/130639426/7277852.pdf
    • http://samsonlongmontlaw.net/uploads/1/3/0/3/130323506/2272823.pdf
    • http://jazzedupdesignz.com/uploads/1/3/1/6/131606134/batudipod.pdf
    • http://two-rivers.net/uploads/1/3/1/4/131483031/bofapap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e6e9.bin
e5a036ec2e51a70ade096d0dae99a7b5bb7ad9ac6ea74e64aa064699f3f29c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6E9 7752 bytes

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