Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a45aec077efb75a…

MALICIOUS

PDF

86.2 KB Created: 2021-04-13 01:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f1fa824f638ec038017b0ea473130ef3 SHA-1: e6b9ff1d27229a57c8110d0ec030bbac912f2924 SHA-256: 3a45aec077efb75a9b4c22dc8a98ededd0c599062da414f14e26b3c23cb28451
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains terms related to 'lawn mower parts' and 'wkhtmltopdf', suggesting a lure to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://dafemum.ru/strik?utm_term=yard+machine+push+lawn+mower+parts In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_601ebacab4077.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/8192778853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_60449f4da52f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_6027d2681595e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_6021e93797bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_601bb3fbcc041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5ffa3efcdc3e4.pdfIn PDF document text
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/xejubotejojav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448548/normal_6035bf7f0dd94.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/periodic_table_of_elements_with_names.pdfIn PDF document text
    • https://siviwoxepigomuz.weebly.com/uploads/1/3/0/7/130739754/8764853.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/80348288085.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/41840511072.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_605b4f232db13.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/d4c4f.pdfIn PDF document text
    • https://tasakexer.weebly.com/uploads/1/3/4/6/134669330/6967357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_604074fb431e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lemizirimafon.epizy.com/55335463892.pdfIn PDF document text
    • http://jimarol.myartsonline.com/86760087237.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/tudevoziwip.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 5368 bytes
SHA-256: 1fe84aef84bd7493342394a5508cc1738a86b40a3c8f08eb71cc826d188b6e8c
font_01_sfnt_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 11540 bytes
SHA-256: 73018bbadfabd034c832ee8f6b1fefdd569b86b1e135f0d11102d21b0f799541