Malicious PDF — malware analysis report

Static analysis result for SHA-256 195fb806ec5d62ff…

MALICIOUS

PDF

30.8 KB Created: 2020-04-10 02:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14fdbaa2d95768479c6fbf2685f9a212 SHA-1: 66b6205abbb1945ef34daa8275e62bd6b5d0413e SHA-256: 195fb806ec5d62ff3784b4627f225b917a84d74f6e6b111e54be92757e8973d1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on SEO-farm-like domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content through a large number of seemingly unrelated sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://intecurriculumforkids.com/uploads/1/3/1/4/131452950/131452950.html#sql+server+express+2008+r2
    • http://cinemacove.com/uploads/1/3/0/5/130540645/1986881.pdf
    • http://waterplanconsulting.net/uploads/1/3/0/9/130969628/5750685.pdf
    • http://cdlsinc.com/uploads/1/3/0/8/130814126/2641821.pdf
    • http://spiritoflightscc.org/uploads/1/3/0/8/130873794/niwuxe.pdf
    • http://integritycontractingkcmo.com/uploads/1/3/0/9/130969960/kixafobazuniwelove.pdf
    • http://mbphysmed.com/uploads/1/3/0/5/130543996/junuforuwexikev_dexozupozur.pdf
    • http://bebebuell.net/uploads/1/3/0/8/130813883/8f111a85449336.pdf
    • http://etceterabypatricia.com/uploads/1/3/0/6/130604467/10e84f270121.pdf
    • http://clclaredo.com/uploads/1/3/0/4/130489023/pipenanekar-bajilizigegid-nafamiwut.pdf
    • http://spacetownkicks.com/uploads/1/3/0/7/130739889/nedufonezejujinunom.pdf
    • http://better-than-bleach.com/uploads/1/3/0/7/130739222/fozivotukude_kinet_xubek_dareliz.pdf
    • http://horseridinglessonsdelmarpemftherapyforhorsesdogshumans.com/uploads/1/3/0/6/130605267/suwomalafedenodilepo.pdf
    • http://mmqualitycreations.com/uploads/1/3/0/2/130289096/vagujidokuwi.pdf
    • http://thefittutoringmethod.com/uploads/1/3/0/5/130589391/bepafosikixomotoxi.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_off000052c7.bin
b82667272de110be53f2373587970121693d85d78a901758640843c37f7a16aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52C7 6880 bytes

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