Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaa8f7670770107…

MALICIOUS

PDF

80.0 KB Created: 2021-05-16 10:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9b184add60b30ee4a7aedb4f6e33c907 SHA-1: 25deab81c4b35879d4f2567b63a7dfa57b8c35ef SHA-256: bcaa8f7670770107ad1aaa2ab52b9f8f4da225fc3f2f37a7b8b7595f2256cc04
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm intended to distribute malicious content or phish users. The primary URL, 'https://soxebez.ru/strik?utm_term=robertshaw+thermostat+9600+not+heating', is presented in a way that mimics a search result, likely to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and extensive link farm are strong indicators of malicious intent, as confirmed by ML and ClamAV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=robertshaw+thermostat+9600+not+heating PDF link annotation
    • https://lozepexowazabi.weebly.com/uploads/1/3/1/4/131409761/1721795.pdfIn PDF document text
    • http://regsenatvumen.website/4314976558288agb.pdfIn PDF document text
    • http://opt05.ru/65293491878xst6h.pdfIn PDF document text
    • https://rizaguvaza.weebly.com/uploads/1/3/4/5/134502188/gisazetinemo-newipul-zebagijajalub.pdfIn PDF document text
    • https://virigegeke.weebly.com/uploads/1/3/2/7/132740897/6deed9d1979.pdfIn PDF document text
    • https://zudepiguzow.weebly.com/uploads/1/3/4/7/134774383/5479916.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/681e761.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
    • http://bokapis.rf.gd/lebebegapajil.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_56aee91269294451b6310da7213415fd.pdf?index=trueIn PDF document text
    • http://kunonepu.rf.gd/basics_of_civil_engineering_ktu_textbook.pdfIn PDF document text
    • http://fikuluki.epizy.com/what_is_a_4_card_flush_in_cribbage.pdfIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_a2cb686a6e03479986b300c9a93ea533.pdf?index=trueIn PDF document text
    • http://towixamum.epizy.com/46078568690.pdfIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_aa7ea37d41e3408d8396de7792fbd366.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_9ce41879a14941d4be855fa5ca8d61ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eabc4dc-848e-46a6-802b-18703483a89e/40851273724.pdfIn PDF document text
    • http://kozibitoj.epizy.com/pixufevekis.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_e1105c77e4dd4204b4ae1d1327756fdd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ddefc4-c281-44ca-8d56-2f1b6f43292d/gatasifafamelofolusidubus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 5544 bytes
SHA-256: d732ba79610509005b8567b11d27f2cd206971bdfefb27f85d7bf06014c30c32
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 11088 bytes
SHA-256: 4ac28908cec9565b1e71fef3fa92d676f020af6769a3da0fb2af0f6f02ed83c1
font_02_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176