Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec92591532ad7d21…

MALICIOUS

PDF

78.0 KB Created: 2021-03-11 14:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a5097f1a6fc939a4aea68f06394e6e00 SHA-1: 206153bcdf52decaaee10921a8a82ec9979d7337 SHA-256: ec92591532ad7d211682023a3a719df9ea262346c023b06f41760d586d9638f0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to a user manual, which is a common lure for phishing attacks. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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/strik?utm_term=chattanooga+m2+hydrocollator+user+manual PDF link annotation
    • https://sinuvofibudibaf.weebly.com/uploads/1/3/2/6/132696377/baxibe_nutumakonimozi.pdfIn PDF document text
    • https://tinofapilasi.weebly.com/uploads/1/3/4/5/134518201/raxuvo-nuvejinizuruf-torurunuxigasir-dugobizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_603c268175b2e.pdfIn PDF document text
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/varifobod_pejida.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/ximodufuwexenelogiramis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458137/normal_5fc878a01f63f.pdfIn PDF document text
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/juzunefevema_rezejinujani_fikiwekiguzovuz.pdfIn PDF document text
    • https://pareruli.weebly.com/uploads/1/3/4/8/134891857/5391407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_601bcb9a58b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_600fac354dbfd.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/vagevokovol_xivokeginaxu.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/kitchenaid_superba_oven_door_replacement.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/xakijirane.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/how_to_service_a_delonghi_coffee_machine.pdfIn PDF document text
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/9526624.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/2005_honda_odyssey_pax_tires.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5ff6758340c7f.pdfIn PDF document text
    • https://gugamuwapubadek.weebly.com/uploads/1/3/0/7/130740318/pufavemaboda-depunagawexevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/50453153125.pdfIn PDF document text
    • http://vakogez.myartsonline.com/sotikidetomowol.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/35528853137.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/pomititibutotogonejeguta.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/meteor_garden_2018_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/52418848672.pdfIn PDF document text
    • http://livirava.atwebpages.com/honda_eu6500is_battery_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/aadukalam_tamil_audio_song.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/ansys_fluent_tutorial_book.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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 5492 bytes
SHA-256: 5be1a627b10629af3876e966e8f6928975a6e0c34ee987c10887f680e84b72ec
font_01_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 14460 bytes
SHA-256: 8e565aeee6d5f598acddf3a8ac088feb4739f73e3ec43281380427e5416e8fcd