Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c6d8e5ee6c456f…

MALICIOUS

PDF

94.9 KB Created: 2020-12-19 07:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5bc238d0efc5ba609229fa7c391f26aa SHA-1: 9aadc37782fe24a5675340ac022c1087641a35e2 SHA-256: 43c6d8e5ee6c456f557e313e386970224baad7f0973f2c0c44ebe1e4048feb3c
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?utm_term=amoeba+sisters+carbon+and+nitrogen+cycle+worksheet+answer+key In PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/bejawadim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f8cbac3b8c1d.pdfIn PDF document text
    • https://pidakulosa.weebly.com/uploads/1/3/4/3/134391257/2232974.pdfIn PDF document text
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/gupogiwupu-robaxerezume-riwukafazeto-losogudin.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/156ada9de819.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/81958e0.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/7ec3108a6e.pdfIn PDF document text
    • https://furutivox.weebly.com/uploads/1/3/4/3/134360368/meragilirut.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/03e11b.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/lokisitutezaw.pdfIn PDF document text
    • https://nalakipivexovob.weebly.com/uploads/1/3/4/3/134385055/wigip-luxudim.pdfIn PDF document text
    • https://zenojunaguj.weebly.com/uploads/1/3/4/6/134668508/1806877.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/1f2a825e-44d9-4201-8c2d-7d7747c3b409/cabin_in_the_woods_parental_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3dabba5-c09c-4efc-9a1f-307f3dfddfc8/kotor_ancient_terminal_answers.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_off0001362f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362F 5740 bytes
SHA-256: 26995b90c9997d7081df9615339998c2588f5d9ba96df3111be7537276c7dbdb
font_01_sfnt_off000149a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A0 10724 bytes
SHA-256: 64e1193f3d82023ba7b0111cc619f1578763ebe3f674609697fd3d1ece42feaf

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