Malicious PDF — malware analysis report

Static analysis result for SHA-256 961839ac8bac0fb8…

MALICIOUS

PDF

79.4 KB Created: 2021-03-11 08:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4663d78d675795860363f71e3b2168e4 SHA-1: 12557378a424f55bb9dbec96ef2cf02223c44c53 SHA-256: 961839ac8bac0fb87ce66aa3463ae943c6eb39b5169f4bcdf942abf90bb88329
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services, which is characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be directing users to potentially malicious or SEO-abused content hosted on numerous external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=produccion+de+vapor+en+calderas+pdf PDF link annotation
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/eb711dfaad5154.pdfIn PDF document text
    • http://zimipodetasasa.iblogger.org/1st_grade_alphabet_worksheets.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/marunogibupimorobuvo.pdfIn PDF document text
    • https://pibulibeles.weebly.com/uploads/1/3/5/3/135324177/2976119.pdfIn PDF document text
    • https://wilalunawotepa.weebly.com/uploads/1/3/4/6/134608105/cff070ea5.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/tubesij-wezoxe-dotovuvawaz-kilozix.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/linularagolob.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/125914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_2372e5f6e2744cfe91e6666f9a06f6a9.pdf?index=trueIn PDF document text
    • http://padukejuredi.rf.gd/korean_grammar_rules_sentence_structure.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_f8b979c91a0e403997e764ee0308f7ba.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_aa963c52b89e4aef9d114ee8b2e5d52d.pdf?index=trueIn PDF document text
    • http://jolavewavesuj.epizy.com/kefevupozebide.pdfIn PDF document text
    • http://vepisokizapam.epizy.com/anaplasmosis_in_dogs.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/vawavuvapajadewapinaf.pdfIn PDF document text
    • http://merojupamen.epizy.com/15193851297.pdfIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_67e1b761a27b46daaeb289ef18ea18b0.pdf?index=trueIn PDF document text
    • http://xuxobijeno.epizy.com/xoremidodisudufafogofivo.pdfIn PDF document text
    • http://lowepasonadoji.rf.gd/spring_4_tutorial_journaldev.pdfIn PDF document text
    • http://sepuxukejobome.epizy.com/golotakulebovurezevex.pdfIn PDF document text
    • http://gigugikokupepi.rf.gd/porsche_macan_gts_cost_of_ownership.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 5012 bytes
SHA-256: 07d254bdf4ac42cae46a5de4aa8bd03a1f141d8fd88915ccd5d7172c4feb55e3
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 11100 bytes
SHA-256: 93bd21db18905655d08d48d6c9e7f20f21d175cb0abbb770b1a099f6f2ec0394
font_02_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3