Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4617818afcb50c…

MALICIOUS

PDF

36.6 KB Created: 2020-06-03 22:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7e2b222d75024c7c364651ef4d6e616a SHA-1: 44a493bac2815b73a4eece4e3a3c4c41cc5bf79e SHA-256: ac4617818afcb50cf38298fde07156e71fcdedae2249385c4f3c92c476d84ade
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a heuristic detecting a large farm of external links. These links, such as http://lq.undesirable.us/uploads/1/3/0/8/130874666/130874666.html#a.+jan+marcussen and http://hollyebrown.com/uploads/1/3/0/2/130287302/6394487.pdf, are likely designed to lead users to phishing sites or download further malicious content. The document body itself contains metadata and a truncated version of these links, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://lq.undesirable.us/uploads/1/3/0/8/130874666/130874666.html#a.+jan+marcussen PDF link annotation
    • http://hollyebrown.com/uploads/1/3/0/2/130287302/6394487.pdfIn PDF document text
    • http://webdisk.kucanadan.com/uploads/1/3/0/4/130483647/jekewajefuwatir.pdfIn PDF document text
    • http://bargainlivingeugene.com/uploads/1/3/0/2/130289503/d7e61822.pdfIn PDF document text
    • http://upennspecialdeliveries.com/uploads/1/3/0/7/130776027/3317620.pdfIn PDF document text
    • http://grayscaleconstruction.com/uploads/1/3/0/7/130740443/wegeju_tifosis_butefasilazarek_bivemarusatasuf.pdfIn PDF document text
    • http://ezohome.com/uploads/1/3/1/8/131871912/9390459.pdfIn PDF document text
    • http://abilitycounts.net/uploads/1/3/0/5/130588395/gogoruroken-zibozupasafomog.pdfIn PDF document text
    • http://outdoorcore.org/uploads/1/3/1/4/131437941/rebes.pdfIn PDF document text
    • http://tailsntrailsllc.net/uploads/1/3/0/6/130622084/2903915.pdfIn PDF document text
    • http://mail.wilsonscenic.com/uploads/1/3/0/7/130775567/moluzevakasiba.pdfIn PDF document text
    • http://hostmaster.costumeunderground.co.uk/uploads/1/3/0/5/130551559/1181918.pdfIn PDF document text
    • http://hostmaster.peaceplaceinc.org/uploads/1/3/1/4/131453330/d311c9769b380b6.pdfIn PDF document text
    • http://lq.undesirable.us/uploads/1/3/0/8/130874666/terms.htmlIn PDF document text
    • http://lq.undesirable.us/uploads/1/3/0/8/130874666/dmca.htmlIn PDF document text
    • http://lq.undesirable.us/uploads/1/3/0/8/130874666/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pomuxiwuk.files.wordpress.com/2020/06/maketibakezigudi.pdfIn PDF document text
    • https://jesebenoj.files.wordpress.com/2020/06/ponawirusekididifogafuv.pdfIn PDF document text
    • https://nuwiburamo.files.wordpress.com/2020/06/xaketuvuji.pdfIn PDF document text
    • https://favogevi.files.wordpress.com/2020/06/noweniditajuguxenegi.pdfIn PDF document text
    • https://nijarabukexi809583250.files.wordpress.com/2020/06/3191580657.pdfIn 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 8

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_off000063ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AD 10224 bytes
SHA-256: 9907024aa172334c73c60978b08a1b6211039f55f9780dd8ba73c638b18794ef

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