Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dadc9152550ae6…

MALICIOUS

PDF

91.1 KB Created: 2021-01-06 19:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 42bf8d9ac7e96c4c6c9f7f1a16756548 SHA-1: d0e18e11d4366c532c9729b62037686cef28af5b SHA-256: 78dadc9152550ae60f6bf86cce7860bd81e5bf69b66cad1d85af4fbca9a2851a
214 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 embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=humor+in+uniform+quotes In PDF document text
    • https://cdn.sqhk.co/lilapanorup/9icgcij/kamujarububomoditaw.pdfIn PDF document text
    • https://latujajadaf.weebly.com/uploads/1/3/4/5/134593938/wasepusupezuxigov.pdfIn PDF document text
    • https://turikiripejuz.weebly.com/uploads/1/3/4/5/134501804/gozilabej_mefapizexav.pdfIn PDF document text
    • https://xapukuzikoki.weebly.com/uploads/1/3/4/3/134381416/bapinefovitorip_dokulis_fejezogepon_fagapetejakud.pdfIn PDF document text
    • https://zotizoju.weebly.com/uploads/1/3/5/3/135349435/4498071.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/vidadaviwal/consumer_reports_least_reliable_used_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/nugiwamulavotezemapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d8265a-7440-4178-97cd-f6a9bc793db2/soccer_mom_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40469df-373b-47d7-bf86-90e32f22d496/allegiant_customer_service_number_busy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3ad694-6db7-4933-9a14-cec9e2379c35/16533315739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0c5a1b-09d8-43d0-9e71-a607c25952d3/alisa_ilinichina_amiella.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_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 4756 bytes
SHA-256: a50a1adb59fe1c5648848c1e70feb0400758c6c03efcd47866c7cccac7f7b786
font_01_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 10960 bytes
SHA-256: 313707f6c8175383baac2e054a4035019d357b40b2faa441ffd5b113d833ab51

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