Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd7403fb6671237…

MALICIOUS

PDF

79.1 KB Created: 2021-05-28 23:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a130bb015de6528d71d76cc5e2283f17 SHA-1: 943757968a23d7fa8291fa2ebb1a99d569ae7c44 SHA-256: 4cd7403fb66712374304e0b4c6d2620e12dd0a4cf85e0fe5fc3fec4918bafc2b
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure and a clipboard-command (paste-and-run) lure. 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 0.9998

Heuristics 8

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://jumiwimov.ru/123?utm_term=aggreko+generator+data+sheet PDF link annotation
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/c6951cbbe3138c.pdfIn PDF document text
    • https://rewiwolidinagi.weebly.com/uploads/1/3/4/4/134481042/9231586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_60656e7de612e.pdfIn PDF document text
    • https://pekizexigobuton.weebly.com/uploads/1/3/0/8/130815014/xidubew.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/8183251.pdfIn PDF document text
    • https://xemiwiwoxotewa.weebly.com/uploads/1/3/5/3/135325065/7194918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_5fca6c0e25adb.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/dibukokuzo.pdfIn PDF document text
    • https://vufemare.weebly.com/uploads/1/3/4/8/134855896/felinotulupigo.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://uploads.strikinglycdn.com/files/fefa3748-a242-421d-98ce-3950ee60428f/formulas_de_area_volumen_y_perimetro_delas_figuras_geometricas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf252d3-93ec-4384-803e-599e51721487/how_to_grow_an_herb_garden_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222ccb8e-439b-4c7a-9522-ad98fb07d070/zujukubidiwipak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658f3b00-94cf-4ee3-94e5-d69c487ca894/59741788107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00729e6-ed2a-4151-a24b-67d35b845b6e/nigedenixetun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37e9ba4-fbb6-4d75-b471-4ce186a7e019/xerosuraragan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8d9d91-aed5-49b6-9cf5-a1817fd5a0f5/96845914774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01d1d9a-8427-463a-a312-14e2fcf6eae9/93663326067.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_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 4848 bytes
SHA-256: 543438cdefb352cd325c61ba1fbc4d908f5196db700d207b7745244db458c550
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 11704 bytes
SHA-256: bbe4c0ed5df6baab1044a79c250e1d4258b4267bfe352b587724797883b64f32
font_02_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3