Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ac51d17112d456…

MALICIOUS

PDF

46.6 KB Created: 2020-04-30 01:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e5b174985884222b373c1b02efd4d236 SHA-1: 32f8bb47309aabe241c65d1950bdb9965e41e03e SHA-256: 08ac51d17112d456c1a24a6d04a596a3d8f81fc5275d5f8d4dd93881ae13ff01
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, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content or manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious.

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://kjdconsulting.ca/uploads/1/3/1/3/131398380/131398380.html#php+array+functions+pdf
    • http://tamayosapparel.com/uploads/1/3/1/4/131437294/pexogonudesur_netijujoxesod_fulemavutaw.pdf
    • http://penelopejfedor.com/uploads/1/3/0/4/130476148/jixuvotovorexu_dajarumasogeles_zoxoxineleteju_kujebubuwovegud.pdf
    • http://onthebellbrand.com/uploads/1/3/0/4/130475959/3844045.pdf
    • http://missbellasfriends.com/uploads/1/3/1/4/131437252/7114019.pdf
    • http://morningpeople.club/uploads/1/3/0/5/130540461/3680370.pdf
    • http://stableandwise.org/uploads/1/3/0/8/130814020/3150487.pdf
    • http://classicalteachingtextbook.com/uploads/1/3/0/2/130270902/3b3938faadcb.pdf
    • http://smokeemos.com/uploads/1/3/1/3/131398295/6008824.pdf
    • http://crewrealestate.net/uploads/1/3/1/4/131407300/dazatopigajakoze.pdf
    • http://homehealthmidwestcovenanthome.com/uploads/1/3/0/2/130288334/59534f69.pdf
    • http://trindoit.com/uploads/1/3/0/7/130775513/7386732.pdf
    • http://www.westtowninc.com/uploads/1/3/0/5/130550712/muzoganuduw.pdf
    • http://instituteforexponentialeconomics.com/uploads/1/3/0/3/130379634/8050784.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_off00008988.bin
e920ee99181780b196d7c6d9a43f726566660966731a80c320b4f9d015c9d5f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8988 10048 bytes

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