Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef80775974ca8621…

MALICIOUS

PDF

83.6 KB Created: 2021-06-07 21:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f47c2865163c29bc567a121c12c8af9c SHA-1: cc91b07b24eab7e3fb6f1aafbbaacfdf59f7f382 SHA-256: ef80775974ca86219b9f9eac87cec9a0c8da6a225cddf403f779526e90cb9bef
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/pbw?utm_term=electric+state+darkrp+script+2021 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375210/normal_5feee9c55cde1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_601f3036c183b.pdfIn PDF document text
    • https://laripevomed.weebly.com/uploads/1/3/4/2/134266376/9913671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_606e023b4b001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_6024cf072071d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369775/normal_60085acf58f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_6023371cf0a53.pdfIn PDF document text
    • https://bategasef.weebly.com/uploads/1/3/2/7/132712490/bulakakexano_vivumi_xakugivukawi_domuxegikume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fd0a7c68d5fe.pdfIn PDF document text
    • https://zedevemekorux.weebly.com/uploads/1/3/4/7/134748521/davamobola-bunokikoruxun-valaritiboz.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/540271.pdfIn PDF document text
    • https://luzurojavozajin.weebly.com/uploads/1/3/6/0/136090511/428687.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5ff1db22ded9b.pdfIn PDF document text
    • https://jukakolirofo.weebly.com/uploads/1/3/1/4/131408741/situvusesebutag-jatisapenakanu-jedoviwot-nolon.pdfIn PDF document text
    • https://pobipumobixox.weebly.com/uploads/1/3/1/0/131070364/5765634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_60ba2a9981a2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/188b3eef-23f6-4a6d-a0b9-8414cb73a853/how_much_do_electrolux_vacuums_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bdd0fe-45f7-49fc-8270-da1d84fd6d84/87434630020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6f288a-f856-4b89-bf1e-125faf1d8648/balake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9935e1-b986-43fe-8945-4d390552d046/what_is_a_sweat_equity_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1203eb-ac8c-4b1e-b7d5-3b8a8827a29e/galileluwedevalupunitifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7789bf-9217-4353-880b-df58ab522b6e/jimukesowugarumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92353407-2c33-4520-af40-d2c1f68ad7aa/mutamanowedogejeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894f9fe3-09fd-490a-820c-c6eef8bce343/how_to_enter_cheat_codes_in_sniper_fury.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5558c3d0-8158-4578-af5f-eddf913246f4/what_is_caron_one_pound_yarn.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_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 5412 bytes
SHA-256: e281c03136888c21bbbfc63ded549e25780437f57293bc37e939c1b7144e1d00
font_01_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 11124 bytes
SHA-256: 2bca5f30b39401af32f3fdb4b8c0b070b4a867a5d1b1403d2a6684926a2134f9