Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3951b5ddcd0ff9e…

MALICIOUS

PDF

83.2 KB Created: 2021-04-12 12:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f8478aecbc5d7d5aed5f808fd6267f6f SHA-1: 6749ffb8fd2c073008eb7770ba5c6aacc2284635 SHA-256: c3951b5ddcd0ff9e5390d8cf2cc7b36a110a6c90c06bb63b289bdcf64ca1f6d7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded links, many of which point to disposable hosting services. One critical heuristic firing indicates a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://yafferge.ru/strik?utm_term=stock+market+live+stream+today In PDF document text
    • https://vaxofawaz.weebly.com/uploads/1/3/2/6/132682661/vowikud_xoburarirawe_pasawiwisili.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/4831371.pdfIn PDF document text
    • https://sumikoxivabozo.weebly.com/uploads/1/3/3/9/133997645/7611198.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/b005fcf93.pdfIn PDF document text
    • https://kebotufu.weebly.com/uploads/1/3/4/7/134735966/f12d5cec2221b81.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/7915262.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/15_business_books_everyone_should_read.pdfIn PDF document text
    • https://xaxomawiso.weebly.com/uploads/1/3/5/3/135329970/5902396.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/mekibe.pdfIn PDF document text
    • https://gerutabelamulef.weebly.com/uploads/1/3/1/3/131384559/fanolurezumixej_dipum_mamizipog.pdfIn PDF document text
    • http://maxist.ru/prepositional_phrases_exercises_with_answersbvxkk.pdfIn PDF document text
    • http://lebojabufi.medianewsonline.com/aprender_italiano_desde_cero.pdfIn PDF document text
    • http://sweetmeet.online/download_terjemah_kitab_minhajul_muslimyprtl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_4afb31db7a8d4d51bb765363be742d7d.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_39c221c306504e719898c984d4657c8c.pdf?index=trueIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_e34d9159b1d0424bbe25f26375e21a32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb126816-75b4-40df-9d61-3710afadee7a/beats_studio_wireless_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502f1f00-e124-4f5b-8b1a-1b06dcb47b64/alimentos_y_bebidas_que_los_contienen_verduras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7427e1-bd52-4ff6-9b8e-c6ae0a76a9e4/what_are_the_3_theories_of_language_acquisition.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_f4251514f14448db828cdc7c2c9027ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f26a01b-bdd9-4bf9-8d22-f94137568962/58489627717.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_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 5416 bytes
SHA-256: c11ad248183894f6b1b0a16d29ad24f9610b0c5dd0765ba2f0e89973b1d8499a
font_01_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 11168 bytes
SHA-256: a91f527a58908e521d99686f23594ae59001fc433f00e57990edcc5651b8cb16

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