Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41e7e8beb840ca2…

MALICIOUS

PDF

73.4 KB Created: 2021-06-10 04:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f94ae99f792651935460a780d7d201ef SHA-1: e12c123374bad5c1ce94470c5cc3c44671ce299b SHA-256: c41e7e8beb840ca280139454ba2667a3adbcd3a596e0540656a83332a5647361
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to various domains. The presence of a URL with a 'utm_term' parameter suggests a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/pbw?utm_term=ocr+a+physics+a+level+formula+booklet PDF link annotation
    • https://dufofisejufosu.weebly.com/uploads/1/3/4/8/134875198/5756622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408875/normal_5fe2c09a9f12d.pdfIn PDF document text
    • https://bupekotarox.weebly.com/uploads/1/3/0/7/130739944/kavagukasolonixif.pdfIn PDF document text
    • https://givovirudodax.weebly.com/uploads/1/3/4/5/134587764/2450122.pdfIn PDF document text
    • https://fivakamine.weebly.com/uploads/1/3/4/3/134384559/5449643.pdfIn PDF document text
    • https://nepujegoxamo.weebly.com/uploads/1/3/4/3/134380276/7202931.pdfIn PDF document text
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/maduwox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456389/normal_6006adef7b8fd.pdfIn PDF document text
    • https://sukigemanewa.weebly.com/uploads/1/3/2/6/132681928/702e87286dd307.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/67023337-0c71-4fd6-956e-cd467e720688/luxipinuxifiviwirexomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/768c4260-a3af-499d-b0ea-b373a5a413ba/where_to_farm_argon_crystals_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d3700f-33ae-4a6f-aded-3e845b02b1cd/zusifix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d665b7-e75e-4be0-9d03-0f3867823d00/baldurs_gate_dark_alliance_iii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73968bba-311d-4d56-94aa-8e0ebfc0b108/dominion_energy_nc_electric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c480a2-0278-4b1d-b17d-69d23f01c1de/93294215999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7efb7198-f6fa-46e6-a0d7-b4b930bb9707/mukekedozumujibar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a09bd3-7dbd-432f-b2c3-0c96a36f09db/83347449258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28808910-e040-4000-8b26-6c5a5ff928ec/clicker_klik1_programming_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9555125c-6b97-4555-8191-50f0b670aed0/80935777407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a76a8a3-257e-4bf3-973b-18eb8825ef6a/10184773060.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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 5648 bytes
SHA-256: 9885fadcf71b23491321cafdbc230356337801cff6cc2269f1d608e89e62a542
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 11204 bytes
SHA-256: b386a9a61960191e3e846aabf8847e1d033c76795f39265bfe109fc0f9193dc0