Malicious PDF — malware analysis report

Static analysis result for SHA-256 458db08b498cbcae…

MALICIOUS

PDF

58.5 KB Created: 2020-11-19 02:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f913f6f6efb0c259482d1dcaa91182de SHA-1: 35a42b2fc956f80a2223ff1f408cf2970799a0c8 SHA-256: 458db08b498cbcaebd0b7837c2534a4997b6e9aac40a481d0b87fc306b96a4dc
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=defend+the+nuts
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f905bac635ac.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4d5351fbb209c0.pdf
    • https://sotewedizi.weebly.com/uploads/1/3/4/6/134698886/kivapelak.pdf
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fa8158e5769c.pdf
    • https://cdn-cms.f-static.net/uploads/4449615/normal_5fa8a00d21a31.pdf
    • https://cdn-cms.f-static.net/uploads/4501991/normal_5faba14e752b6.pdf
    • https://zeronifoza.weebly.com/uploads/1/3/4/3/134312515/giwubakim-bixed-vufuj.pdf
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5fb4838e0a040.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nefagolom/lukuxasigibakivubumodaro.pdf
    • https://uploads.strikinglycdn.com/files/59dedfda-d804-46bf-a63b-10e15eaff099/ant_man_2_google_drive_mp4.pdf
    • https://uploads.strikinglycdn.com/files/41ad697e-6569-4095-b619-b825df9424e5/vonupogomiribewaluk.pdf
    • https://uploads.strikinglycdn.com/files/3b206453-ed59-4283-9a48-cc77d808cfc0/92389283026.pdf
    • https://s3.amazonaws.com/baxegezivumi/sadig.pdf
    • https://s3.amazonaws.com/jepinebawo/fate_go_merlin_dialogue.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeb4.bin
957459b74b6c69a56ad7139cd88e08f816e15f8efeacd0d002a34357c1b3dbd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB4 4656 bytes
font_01_sfnt_off0000be97.bin
a0dff8768a67af41fd9c149e6cc4fbcb176bb3a8c87c80e9ddfe9667902a4282
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE97 9164 bytes