Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15761660436b86e…

MALICIOUS

PDF

80.8 KB Created: 2021-06-08 05:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9cce7236d29280535bdc85805f5b1079 SHA-1: 9c4442bb10b7861b3cde8d0d57ee79a8fd9a393b SHA-256: f15761660436b86ebde7889d060b15cad878b3f7b800560664ed3e3d21fde3ba
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/pbw?utm_term=which+of+the+following+factors+affects+the+choice+of+distribution+channels PDF link annotation
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/6273100.pdfIn PDF document text
    • https://subifegeriw.weebly.com/uploads/1/3/5/3/135348524/fukorudofixojod-nisexu.pdfIn PDF document text
    • https://wijugiretatito.weebly.com/uploads/1/3/2/8/132814958/09095128.pdfIn PDF document text
    • https://gevurimeme.weebly.com/uploads/1/3/7/4/137499240/332573d.pdfIn PDF document text
    • https://bavazaje.weebly.com/uploads/1/3/4/3/134335981/zemubipesom.pdfIn PDF document text
    • https://laxabuzataz.weebly.com/uploads/1/3/4/3/134385801/1555154.pdfIn PDF document text
    • https://givosusomab.weebly.com/uploads/1/3/5/3/135349573/5385438.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/lutowefu.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/9a78595d-43fd-4363-99d3-d8ae996f8e1c/kung_fu_training_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5083ba-b247-4f8d-b606-88be3d8c9eb2/havasul_kuran_kenzul_havas_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a51b9c4-0055-48b3-bcc8-c136626ef240/xasowir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3d1af6-8525-4ab6-aa5d-852450ba4846/wafazamilowafawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec24721-7232-487f-84bc-cace7dc2e232/29350115256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dcf2794-e63f-4b1c-a081-431731b6cce1/oster_tssttvfdxl_manual_french_door_oven_stainless_steel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ca8bc2-ac52-4e5f-bdec-be3a8c17cb78/h4n_pro_compatible_sd_cards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289c003a-e838-4e13-b23c-ca4c7cbb0060/89843794955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52047307-24c2-464d-b2ea-491a5e7c48bb/27136087758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1f5bdd-5912-4867-9eba-0292c0a30d45/98701813642.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_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 5528 bytes
SHA-256: 4db7796663b958822528dfeb5b1218c0c0652ace95ea1504d4f0bb0704b3bf07
font_01_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 10672 bytes
SHA-256: f1288bc98264f560b9e00e14471d30a02be9b633b82becce3175815736c75c8b