Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8acfcad59dea2b…

MALICIOUS

PDF

76.2 KB Created: 2021-06-10 19:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c3c97183b80c8f5eacd9e1a5141c2b29 SHA-1: c41b36328010182f0520f42e49f57dd91fb06ef6 SHA-256: af8acfcad59dea2b571568a6adb26c07319270647c123d6f380ca996cfe87497
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage are characteristic of a malicious document attempting to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/pbw?utm_term=1985+electra+glide PDF link annotation
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/342f6dd12c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5fc93162d2946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_60492bf0a6762.pdfIn PDF document text
    • https://tobedetileva.weebly.com/uploads/1/3/5/3/135337372/sadowomejurazav_rolunowisi_wufozejetisuto_tebupito.pdfIn PDF document text
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/pibasesaj_kepamiwidi.pdfIn PDF document text
    • https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/5583224.pdfIn PDF document text
    • https://ruxakadun.weebly.com/uploads/1/3/0/7/130739963/7236062.pdfIn PDF document text
    • https://nerefowat.weebly.com/uploads/1/3/4/8/134856831/rawuxajaf.pdfIn PDF document text
    • https://danuxuzajuzawo.weebly.com/uploads/1/3/4/7/134768569/xuporutoburim.pdfIn PDF document text
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/5f7adc505dd.pdfIn PDF document text
    • https://dadajiwo.weebly.com/uploads/1/3/4/8/134881642/potuwefogeme.pdfIn PDF document text
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/9776745.pdfIn PDF document text
    • https://tunogurepuxi.weebly.com/uploads/1/3/6/0/136054619/3d6364e1662073.pdfIn PDF document text
    • https://fasipibopokele.weebly.com/uploads/1/3/6/0/136096953/36f89153eabb48.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/wonazedubox_junutikiwapugo_kedor.pdfIn PDF document text
    • https://xugasejesakegeg.weebly.com/uploads/1/3/4/6/134617370/jaserofitawa.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/7549766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_60554e6dd25b4.pdfIn PDF document text
    • https://pidakobanaxob.weebly.com/uploads/1/3/4/4/134463411/ranemiwinus_ninoso_robedukobis.pdfIn PDF document text
    • https://mesitumavitolo.weebly.com/uploads/1/3/4/8/134866133/4762878.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/pixetavavisawuk.pdfIn PDF document text
    • https://sunerewej.weebly.com/uploads/1/3/4/7/134724547/mobifajesevase.pdfIn PDF document text
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/1145030.pdfIn PDF document text
    • https://vitebikune.weebly.com/uploads/1/3/4/8/134895950/1462362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_60c101a14579a.pdfIn PDF document text
    • https://linoratu.weebly.com/uploads/1/3/4/4/134403550/potidivaton-bezeximapotav-dubuwapox.pdfIn PDF document text
    • https://dofenerezi.weebly.com/uploads/1/3/4/4/134446603/kufisoliwomo.pdfIn PDF document text
    • https://leziwave.weebly.com/uploads/1/3/4/4/134446015/658263.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
    • 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_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 4932 bytes
SHA-256: 65f43fe2255522f2cefc38cb935d30022946444e2eb1f8952b96f9f48ccda01d
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 14376 bytes
SHA-256: 5f63cc57317a8a49d8225eed37ab6af54aea7a03af0309531bbdfc2a62b5e1ee
font_02_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3