Malicious PDF — malware analysis report

Static analysis result for SHA-256 e156c71b0ebbb85c…

MALICIOUS

PDF

96.8 KB Created: 2021-03-22 22:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c442086b5c93d463be78e839a2894f3 SHA-1: fb1487a431c5615b0e93dfb99debfe893f406879 SHA-256: e156c71b0ebbb85c25a67b20e98867f9aabf378cd7d2264c2fd3068651d1a6b4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings strongly indicate that the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://resalured.ru/strik?utm_term=what+are+basic+molecular+biology+techniques
    • http://instacopyrightcenter.com/gifaritisulislu94.pdf
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5ffe26445231c.pdf
    • https://memudejiremi.weebly.com/uploads/1/3/1/4/131405951/7499019.pdf
    • https://cdn-cms.f-static.net/uploads/4389084/normal_6029707a3097f.pdf
    • http://clubstore.info/how_to_install_a_rheem_electric_water_heaterkevm9.pdf
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/02784.pdf
    • https://cdn-cms.f-static.net/uploads/4471235/normal_6039d03e96b36.pdf
    • https://bigakobavivab.weebly.com/uploads/1/3/4/7/134747120/jowegamojuni-lekumunumut.pdf
    • http://osthondroz.com/333256846239f3a8.pdf
    • http://insurancecarusa.com/wrt160n_default_user_and_password5y076.pdf
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/2417786.pdf
    • https://tiwixuferexo.weebly.com/uploads/1/3/1/3/131380596/wixilezukufex.pdf
    • https://cdn-cms.f-static.net/uploads/4386074/normal_604d9a420d66d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f83ce3bd-a9d4-44c9-847a-be05d7f61fd3/dunkin_donuts_large_iced_vanilla_latte_calories.pdf
    • https://uploads.strikinglycdn.com/files/cbf76b34-d683-4eec-af3b-de1d7769f8ba/chick_fil_a_processed_food.pdf
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_9585d7c155f54e25ac7d6a4f87953ce0.pdf?index=true
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_4c8cbe8f09384638923166c1a22caedb.pdf?index=true
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_5e49f02a47ae4190881a8ddfb868055c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75aa8492-f6c7-4c1a-ada0-8ede54d1f2d2/axial_scx10_ii_body_post.pdf
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_a9bf65c09d88419281ff3974defe3f2d.pdf?index=true
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_84340153d20b483481c982809e78107c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b1f.bin
8b8dc5353458873a5bf103483285438c8e9223c51a09b2aaaddd7945453f5dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1F 5592 bytes
font_01_sfnt_off00014e0a.bin
cb35ce60f6d741c9a753da5d2aeb952ddb6febf1a422c5fb3da71e01df68eab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0A 11224 bytes

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