Malicious PDF — malware analysis report

Static analysis result for SHA-256 1943fba5657653c4…

MALICIOUS

PDF

82.7 KB Created: 2021-03-25 08:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5856c1b0e9c42f4250a37934868c5c9e SHA-1: da59f3aebe3b06b0e63220cb7bb90551b7acd93a SHA-256: 1943fba5657653c47ef927129b6d3a438989836d6d10be538312848f24f48d40
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one pointing to a known malicious redirector and others hosted on disposable infrastructure, suggesting a phishing or link farm operation. No scripts were extracted, but the presence of numerous external links implies an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+night+manager+season+1+episode+3+watch+online In PDF document text
    • https://rifunojurese.weebly.com/uploads/1/3/4/3/134370075/36124f.pdfIn PDF document text
    • http://fito4ka.xyz/515143849345g1xt.pdfIn PDF document text
    • http://opensalle.xyz/what_is_the_theme_of_three_skeleton_keyzdewg.pdfIn PDF document text
    • http://womenit.space/selapizibixopojuripiemup.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/aac978567b282f.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/rigakojug3xome.pdfIn PDF document text
    • https://jevakotimafunu.weebly.com/uploads/1/3/4/8/134878594/2e17534d.pdfIn PDF document text
    • http://afracheat6.xyz/uppababy_mesa_base_instructionszf86u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_3bc2eb653f9241519bd3d238e8557855.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71133029-7f6b-4347-9d6e-44efdef4a957/12440222774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774496fd-8e03-4697-9e5a-570a4a743846/3537829763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423b8492-a41d-4531-b72f-0b9824e29a31/wosalazojuwuxanozaxusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1073281f-68da-4fc1-abda-7c420c865201/how_much_does_it_cost_to_change_to_a_tankless_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3ac9f1-a72f-4a9c-bb5e-698bdba32c95/nedavekolulivetowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a830f50-19c5-4dda-b588-eddb33ae8af7/66687570988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51096f0b-27c3-481c-894c-ab2ecaef9a97/what_is_bruce_lees_wife_doing_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/680242f6-e156-4fd4-8fa9-67fb22f04938/30593706171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803fc288-ed5d-4578-a3df-79fdf2e56b10/dias_festivos_en_los_estados_unidos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983ff857-cf9a-4e34-b4a7-5ce515ee5159/who_makes_diehard_batteries_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3142ed0c-7b3a-4f14-b9d4-0c661524c381/najogevevikebororazot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c393e9c-4303-4339-9ed4-23c8319785e2/43248258989.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_97bd6630683043ad8ed6b7fe725043f5.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_6e3037910fde4a3985cc2ed1d37e9390.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 5744 bytes
SHA-256: 83100bd99b3c83d24ae705fd92381593f4f1470ed6e30a765dd30c9dac21ae03
font_01_sfnt_off0001141b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141B 12088 bytes
SHA-256: 4b4db094e933c9d143c71fb837469879122db96a26a842778202ab5f7b4f4c64