Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4af5c5c4228d5a…

MALICIOUS

PDF

103.8 KB Created: 2021-01-14 13:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fc7682b04128924f91a0b07dac082c59 SHA-1: 482a61bfd55b09a92ddc86c3593283ed2bd2af8e SHA-256: df4af5c5c4228d5a3a9609d4d97458faa23c599bf9a9b77f03d584084c1bcc8d
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable or dynamic DNS services, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt 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://traffset.ru/aws?utm_term=bangladesh+navy+uniform PDF link annotation
    • https://cdn.sqhk.co/zokuwagopole/diahigi/25206250204.pdfIn PDF document text
    • https://cdn.sqhk.co/xesofosirija/gc18Rz3/tuxebikat.pdfIn PDF document text
    • https://site-1177469.mozfiles.com/files/1177469/donafuniz.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/8b45f2f2.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/6225861.pdfIn PDF document text
    • https://site-1175580.mozfiles.com/files/1175580/2229493358.pdfIn PDF document text
    • https://fefefilax.weebly.com/uploads/1/3/2/7/132712664/tavuguriboseju_zatok_paxoxifupoj.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/3321769.pdfIn PDF document text
    • https://gozulisob.weebly.com/uploads/1/3/4/0/134012313/rozurenixiz-lumadijeros-robewaxepusofu-tomoner.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/pakipetikotopol_vadupobop.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/Tkhfifb/bollywood_ringtone_2019_kabir_singh.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/3515542.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/hgVZ4gf/minopuzuxokabatatigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/simple_accelerometer_android_code.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/aetna_medicare_prior_authorization_form_for_zolpidem.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 5532 bytes
SHA-256: 9b2f788e1c911bbda69e47184bb516645f5f302791481afc611856d640ade74a
font_01_sfnt_off000147af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AF 10292 bytes
SHA-256: ff2d552bf4edd0ca712d540832fe726a8fbd8eb1fc34e05ac5e4fb313d270499
font_02_sfnt_off0001699b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1699B 11724 bytes
SHA-256: d05457f21f9477b26ea77995b57ff27b210cbafaad05975288f829ff4d8b2541

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