Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44bcac1df69ffb8…

MALICIOUS

PDF

80.9 KB Created: 2021-05-05 22:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f26aed1638a00072fdefc9661dd4050 SHA-1: b0c253c1b86b5d1fc11af0e090d97a42786b75c8 SHA-256: b44bcac1df69ffb8dd25122ad51642fc53ea14afd7513e0ccad82a212ec0f635
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The primary URL, 'https://jacksth.ru/strik?utm_term=chili+cheese+tater+tots+sonic+calories', appears to be a redirection to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=chili+cheese+tater+tots+sonic+calories PDF link annotation
    • http://songkfrk.site/sixudidivasipagozarevajiw4upv.pdfIn PDF document text
    • http://xteenware.online/23844148060yr873.pdfIn PDF document text
    • http://instasale.company/monitor_cardaco_atrio_altiusdb13k.pdfIn PDF document text
    • http://whitetwo.space/zogobevubilifcb6jc.pdfIn PDF document text
    • https://dakurawal.weebly.com/uploads/1/3/5/3/135321076/vadaduwuwarofoz-tuvumuvivebo-lajexu.pdfIn PDF document text
    • https://winapusumebut.weebly.com/uploads/1/3/4/6/134695108/lodekedafozi.pdfIn PDF document text
    • http://detonic-ufficiale.website/javanixonelikeruj1oz.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/df3369139.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9587b32d-be95-43f1-b12c-3148f376dcc9/84458635558.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_df1f5e5cc3594bcb81e64ac7a46f07c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bd47a4-41d4-4124-95ab-c8d554c4ad25/what_is_the_congressional_reconstruction_plan.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_7303602f667f4642a67f379321ecf045.pdf?index=trueIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_067d3cf650a04448b3d9362cfbb28a5e.pdf?index=trueIn PDF document text
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_44a57f764b1445de902eb8218e7b43ae.pdf?index=trueIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_79ceac87114441de871ef4ab5e5cae58.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_af3f5e7f39f349ea82eb80b4a8b448c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0cfd7b2-5c81-4d76-9a44-24cce11fe6a2/wudelinaboniguvudixet.pdfIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_c52f67ae2bd0456e8789619bd26d6550.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_8447fa2f4756415eadd30e5b11b6e1c0.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_515ed80769ee4781867e0723e0cd6370.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_9edc0edb7b3a48d8826c21700cc9ff0b.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_f52b141448e1455bae686b48e854b3f3.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 4700 bytes
SHA-256: 1eb0a945b2b03f8e6bed9960e6f63abacdf254c4d4cb581c66fc239a2862dabe
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 10968 bytes
SHA-256: 84849995005bb1bfaf9427034ec86af149709ad625d6e281554ddda391ceb3f0
font_02_sfnt_off00012794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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