Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f974c3d4e66971…

MALICIOUS

PDF

81.8 KB Created: 2021-05-13 13:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6c65ac746a5016979415f67cae2bf86 SHA-1: 21c40f2a9d705299795b5a84a5ce1132d941d6d1 SHA-256: 75f974c3d4e6697140eab4fdbb05a2839e9d740c1431fd7542a4c26429050d07
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 hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a campaign designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=how+to+setup+genie+remote+control PDF link annotation
    • https://cdn.sqhk.co/fosigigamef/hidzmha/capsicum_extract_patch.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/ijijhgh/checklist_manifesto_indir.pdfIn PDF document text
    • http://toppiksnack.xyz/762998775449sc9n.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/eFjcifC/sterling_silver_abalone_jewelry_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/nhgEha4/road_trip_beer_pong_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/pujimuxuja/dAifjcz/34099203259.pdfIn PDF document text
    • http://wiinorama.space/donald_barthelme_snow_whiteucekw.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://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_bf27fe5024b84d99a649523208b63bd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da79d42b-3d36-49b5-8fa3-a325c6f70d2b/can_dehumidifiers_be_repaired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ced648-f206-4f5c-8216-a82d37b6ef61/92327366026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ca62fc-19e5-4c14-9faf-c138761fb773/29509989646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f59028c-341e-4578-be40-efc7222cb7d6/is_garou_an_anti_hero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7794dd-c3a4-4c39-b020-72f511d4d38b/galezixejexiluvaxe.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_f45c41c6af194402a5614b8a717adb04.pdf?index=trueIn PDF document text
    • https://beb587af-1766-4a1c-893d-8c04a9882fa7.filesusr.com/ugd/f3bec4_27c7ca6c898e428bb40357b2c6c759ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de53b67-35e8-45cb-bac3-324220eef70f/can_you_get_paint.net_on_mac.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_1a3ed10a84ec4a819f474c91c629afb0.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_675521e421054dc1b4ed833b8c25ce70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79749bc1-a014-406f-a2ee-fc034f48c8a4/what_does_deviance_mean_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6805632-0d55-4cf8-b688-95f98d252cde/laserjet_p1102_toner_cartridge.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_fe1fb6baf4e648d796bd1754f076e8fc.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_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 4976 bytes
SHA-256: 5870a732f11a3c47976575c89d40effc2335e70faff67fc4530be9ffdceeecf0
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 11356 bytes
SHA-256: f5ba0375c2046daeb7e4427ab1d2666a143d05f068354889bbdca3a8f7ca9482
font_02_sfnt_off000129f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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