Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f50b2c01b40814…

MALICIOUS

PDF

79.2 KB Created: 2021-05-30 16:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d44337c084178994e16ff032a747d43e SHA-1: 1f8637635bbdddd30ad1f6601e047f48a35f69f8 SHA-256: 80f50b2c01b40814fe812e5eefcfdb2e6bd4cf57cbc871be63c8b2ea7d151cf7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, https://midufefew.ru/strik, is likely part of a campaign to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

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://midufefew.ru/strik?utm_term=qaseeda+burda+shareef+in+urdu+translation+pdf PDF link annotation
    • https://pilopagitek.weebly.com/uploads/1/3/4/8/134856928/gulutubomanot_sijan.pdfIn PDF document text
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/4000356.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/5088935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_60553469b5747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_604d08612f503.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/nalagubufanisaz.pdfIn PDF document text
    • https://zagibekopawof.weebly.com/uploads/1/3/1/4/131453283/jetomereterufofoso.pdfIn PDF document text
    • https://nofexozodaxo.weebly.com/uploads/1/3/4/5/134522082/repifi_zozeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fdab89d788cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530323/normal_603c480138ad5.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/piraw-jusewuj-jaxemude-wamepufid.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/0f916dba-4697-4fe6-bc84-596855a78605/91885426640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2775f6ab-54dd-46eb-900d-d4dd57dedebc/15396959283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0956f1-0c87-438b-8fce-07f45f9554cb/the_shining_twins_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8323e72a-f824-4987-a2dc-c8ede19e4b5d/chords_arcs_central_angles_and_inscribed_angles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a7a24b-b78c-4f64-b351-65e9d63bd795/nofudijepibusaweburowere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a844866-c8ab-434f-9fe7-e720a5e973e6/63583090395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f80563-7be9-42bd-9629-5c915799390e/zivexuxukuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ddfc37-84c7-4c41-b3d0-381f747ddefc/xupinebagokiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0c0ffd-6ae8-42f4-ae74-084064773501/2699841134.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011299.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11299 18176 bytes
SHA-256: 7d919940801c14392b999ceffd4d06a69ea4d17e3fb8f65d6a9f3b8ba8562455
font_00_sfnt_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 5328 bytes
SHA-256: d233639cccfac087ea4a4804c2c7dae749bf3e579eab7c820f05085cf3b32d2f
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 10712 bytes
SHA-256: 6828850329c4b17448c432da01debcca743c6a289c0b16cb6549e6178e11975a