Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d04976418b490e…

MALICIOUS

PDF

70.6 KB Created: 2021-03-21 10:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fb0688583dc8fc2d0a3d8e265a6330d2 SHA-1: 6167cf740d45867c350b8e60a3efb866231f348f SHA-256: 03d04976418b490ed573aea36e933c694c40b1d384bdb49727d9f59d149d0f97
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification yielded a high probability of maliciousness. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=ags+publishing+algebra+answers PDF link annotation
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/6abf6.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/zadafox.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/giorgio_agamben.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/43322562553.pdfIn PDF document text
    • https://pegofugetil.weebly.com/uploads/1/3/5/3/135347090/881a0e786e73be9.pdfIn PDF document text
    • http://zujejilolo.scienceontheweb.net/putezanosapiwajurironifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fd17d64075a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5fda934e0954c.pdfIn PDF document text
    • https://cdn.sqhk.co/toneribabut/QhbWjha/woodworkers_bench_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/pidikuso/gjBwXUp/giramebela.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/zhchd32/teddi_mellencamp_husband_net_worth_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445337/normal_5fdd45ad76ab5.pdfIn PDF document text
    • https://ralawuxageg.weebly.com/uploads/1/3/4/3/134319431/6a76d3a4d7.pdfIn PDF document text
    • https://pujowuvorokom.weebly.com/uploads/1/3/5/3/135347933/4bddb8374a3d6d0.pdfIn PDF document text
    • http://midimox.getenjoyment.net/creepy_short_stories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_86ee82c2f74f433ebbba6e0e3ce867b3.pdf?index=trueIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/hx_stomp_update_8_blocks.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_5e49f0e233b144cda8efd29374f0267b.pdf?index=trueIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_174a67401f5d451994331a5a6c314140.pdf?index=trueIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/men_without_women_book.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_33d11c1ad0f746a9bda131248b42508d.pdf?index=trueIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_f6e1d992f8dc4a57a5bd282520384b22.pdf?index=trueIn 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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 5300 bytes
SHA-256: 5572ef394450d6fdcb0afed4ae4ea0c865d1c4bdff3f72f197da4aad21361158
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 10416 bytes
SHA-256: afd90a85e272e348014576434b7b8545bf80a1a8dfa5e8c1a6e45499c786c74f