Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa57be1fce8e9121…

MALICIOUS

PDF

66.3 KB Created: 2021-02-11 07:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5d2ba63697acffdf453a0e0d1fbe19ad SHA-1: d18662c3f00e7f78061c48140f1b3542eecefa61 SHA-256: aa57be1fce8e9121a0bee28c2332dd34c2b581152f4d23dbbab11d28ed2f09f0
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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 https://jacksth.ru/wb?keyword=birthday%20wallpaper%20%20images PDF link annotation
    • https://cdn.sqhk.co/konafomaz/ifgiyg3/subep.pdfIn PDF document text
    • https://bomuwokobija.weebly.com/uploads/1/3/4/0/134041081/sezijugunotaro.pdfIn PDF document text
    • https://cdn.sqhk.co/kolazapikib/aEigDjb/weed_wacker_gas_vs_electric.pdfIn PDF document text
    • http://autocredit.moscow/zodexemomeninibufumuw9t14.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/jgjiLhg/pirafuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/sabeludejem/je9pjgp/tepegavinewakew.pdfIn PDF document text
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/ribinibituviz-zugujaf-xizexiwes-zajunopazeja.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/fOsjchb/iron_deficiency_causing_itching.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/YIheXhh/74620436034.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/ijdrRD9/jamafipo.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/QcrVjfm/70225493403.pdfIn PDF document text
    • http://bobimesufapi.iblogger.org/37196938666.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudosikewemer.epizy.com/nujesopuvez.pdfIn PDF document text
    • http://dorizoki.rf.gd/septic_abortion_guideline.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/69166009473.pdfIn PDF document text
    • http://tigaxulajaju.epizy.com/younger_brother_in_korean_formal.pdfIn PDF document text
    • http://sasomibaben.rf.gd/64964332686.pdfIn PDF document text
    • http://bazogojuzularib.rf.gd/tazotib.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_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 5616 bytes
SHA-256: 8368448692d7f64f99e980b8bd527b142503283206cb39a7225b0c714f5b35f9
font_01_sfnt_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 10136 bytes
SHA-256: 12dc94373302f707c3642643067e94fa7b3b00f04b30825e1e093c76765c2c7a