Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed2c0c64240995b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-12 13:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3a0dfd52355b03666cfd511d95333863 SHA-1: 003002d27e01be85497f5f75870ff0705811fdf5 SHA-256: 4ed2c0c64240995b1048399212de9a68cbd3abc6746e4a97b8d89e2a8b468472
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 designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs 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://xajibur.ru/123?utm_term=halloween+pumpkin+carving+templates+cat PDF link annotation
    • https://cdn.sqhk.co/givesaxi/gcDgghf/hot_springs_story_2._4._2_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_6040db9e0fa87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_601010a6a2fb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_600326cb34a7f.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/kYr3dJE/english_to_odia_dictionary_for_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_6016d331b2a90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_a3db80867a3841b09af872b0cc297cd7.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_8d2cd41b518949c0ae03e39787bf8563.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_9de1ca33bdec4b1ca144d14a71394a29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/099cce5a-d745-4680-a4e6-ebd6f2e37302/how_many_tribes_in_native_american.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_34a39c17a8e045d79a9c7ab3e04fb5bf.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_b7b8aff236ad4b59ba088afc7a55f780.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/857c8f31-b7de-4df7-844e-a663760d0b66/suvajafesijaman.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_0b7616bef3cc4702a0358474e0499744.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_355dd44d27bd41bb80855aacf776bf09.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_65146ebf1f2640a294c8e27722967417.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d3edb6-cade-4be7-a32f-3aa72b6964de/ice_cream_recipe_chocolate_no_eggs.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_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 5428 bytes
SHA-256: e9b9cea7dda0659a0fa48133c4b41bb3f4e7a56b337abe8346776e656b97c70b
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 10400 bytes
SHA-256: 5329d4776f38719012bcec6a7c12ba9d42aa5a6dd2deefa287282ac7c9aa0507