Malicious PDF — malware analysis report

Static analysis result for SHA-256 056388fe8ae38f6a…

MALICIOUS

PDF

70.3 KB Created: 2021-03-09 20:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aabe57cdc188a87a7f6142fd5910f9f3 SHA-1: 528f9fcdebf324b63046ff50b6b2459cfcf72f97 SHA-256: 056388fe8ae38f6acca35d08a3116811b8053a4c2927f412db83c669788b2fcf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=expanding+two+brackets+worksheet+tes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371809/normal_5fca35685cc71.pdfIn PDF document text
    • http://matcobzor.ru/sample_appraisee_comments_for_performance_appraisals7tvuu.pdfIn PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/b438e.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/2257445.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/zolekudanivofexezi.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/25351571861.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/motawubuturi_tufuxawope_mokulezabefiman.pdfIn PDF document text
    • http://mavisuvegepufi.iblogger.org/world_time_calculator_free.pdfIn PDF document text
    • https://mapobosani.weebly.com/uploads/1/3/4/3/134385232/woxonelatovotubu.pdfIn PDF document text
    • http://cardioactiveuficiale.site/41503486903twcwj.pdfIn PDF document text
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/rupitafogagilut-semota-rixaduneridoxuf-mudif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5fd8b402e0a71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_787c77cf7984408cb43b9a9b2322ffa5.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_b9273f96898b4d09b020820696137e58.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_1f528e083bca4420bfec45e224685ea5.pdf?index=trueIn PDF document text
    • http://givaradipokez.epizy.com/rivudekixopariseb.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 5624 bytes
SHA-256: 3b8ce4a0abacc8cee4e8bd1a00d1f92ed0cfa70610bd889b9011108427786f2c
font_01_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 11116 bytes
SHA-256: bc72e044905d04b88e0c5be81dc7d2ea880d81e002129d66f9c26bfddd3dd2e9

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