Malicious PDF — malware analysis report

Static analysis result for SHA-256 a170e91a56605124…

MALICIOUS

PDF

28.8 KB Created: 2020-05-23 01:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 8c9069fcbdbdd3a13ee9c9ec6ae2ebe0 SHA-1: 97b7ee8443025e58dd86b18b6b6cf85d83a2f86e SHA-256: a170e91a56605124cc93e1a5aefa360af5f97280d214fb43c253e20a356a865c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO abuse tactic. The document body contains a mix of seemingly unrelated text and URLs, further supporting the idea that the primary purpose is to redirect users to external sites. No scripts were extracted from this sample.

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://carpetcleancary.com/uploads/1/3/1/3/131383514/131383514.html#kenmore+humidifier+758+manual PDF link annotation
    • http://greaterplanet.org/uploads/1/3/1/6/131637333/3643955.pdfIn PDF document text
    • http://mkmconcessions.com/uploads/1/3/0/7/130775443/jidaduli.pdfIn PDF document text
    • http://bluecloudvape.com/uploads/1/3/1/0/131070894/8073471.pdfIn PDF document text
    • http://stnsecurity.com/uploads/1/3/1/1/131163563/fesiv-vadejezetekag-xotiwutixe.pdfIn PDF document text
    • http://aaceconsulting.org/uploads/1/3/0/7/130776519/66784.pdfIn PDF document text
    • http://need-organization.org/uploads/1/3/0/8/130814065/zadejema.pdfIn PDF document text
    • http://przewozyautokarowe-torun.pl/uploads/1/3/1/4/131438091/0547da20fa87a.pdfIn PDF document text
    • http://dejaguar.com/uploads/1/3/0/6/130621141/c14d0cfac9435.pdfIn PDF document text
    • http://lawofcyberwarfare.com/uploads/1/3/0/2/130288379/4492804.pdfIn PDF document text
    • http://seeingtheworldinadifferentlite.com/uploads/1/3/0/5/130551794/84344.pdfIn PDF document text
    • http://111sog.com/uploads/1/3/0/5/130551526/8657191.pdfIn PDF document text
    • http://worldadvancedsolutions.com/uploads/1/3/0/7/130775047/vawejarux_fukidij_nepogodenupowa_zalaraderugim.pdfIn PDF document text
    • http://gimeproductions.com/uploads/1/3/0/6/130604787/ritowit_lefiguniw_rivuxusiwerugu.pdfIn PDF document text
    • http://beforeverhome.com/uploads/1/3/0/4/130488565/0301ce2adf2cbe8.pdfIn PDF document text
    • http://valleygardendesigns.com/uploads/1/3/0/8/130874583/tofipupogufiw_fixofesituboba_rukuva.pdfIn PDF document text
    • http://app-pof.com/uploads/1/3/0/5/130588157/vanadud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49C3 8780 bytes
SHA-256: fb2cb88946a26ec94f0686fdd3275fe3d91873b85c7a5bca050e4fbf33203fee

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