Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8f9290670a3237…

MALICIOUS

PDF

79.1 KB Created: 2021-04-04 03:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b582b8ea789d3e0397f2451e14f79e21 SHA-1: acc5901fc5f32874f67dfdae423793df50711ee9 SHA-256: da8f9290670a32376c2191f233a1d5546bde3d1a26085732151ba61477dc2cf8
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, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=vox+ac15c2+settings
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/9162b39685b617.pdf
    • https://cdn-cms.f-static.net/uploads/4371509/normal_6037172edb002.pdf
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/9ea464fb.pdf
    • https://cdn-cms.f-static.net/uploads/4417039/normal_60351ed6939d8.pdf
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/menudijifuvijo.pdf
    • https://jiliwadikejupa.weebly.com/uploads/1/3/1/3/131379685/jujopuvaxewibul.pdf
    • https://cdn-cms.f-static.net/uploads/4423453/normal_6021f0862386d.pdf
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/sijopewuxukizi.pdf
    • https://cdn-cms.f-static.net/uploads/4451544/normal_6023a17b429e2.pdf
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/5353883.pdf
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/nafuvokemiwu-jewanomusaj-debutobezovuni-sonukaso.pdf
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/nepidorone-wegigalozot-goxavuziw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8a4dbecc-5894-4cc1-ad1a-02871b5971b1/58990971155.pdf
    • https://s3.amazonaws.com/xuzed/jazaruwanosawiwile.pdf
    • https://uploads.strikinglycdn.com/files/d7db6fb1-59d1-4d9e-b9a6-94eaa8c4e11c/zulebuxe.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_0f07356456fd4a3f98acad45186b635d.pdf?index=true
    • https://s3.amazonaws.com/lakadutof/define_formaldehyde_synonym.pdf
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_52f92f13aa794343b9c5d9f5163ee9b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3bd7cc98-f532-4116-ad88-31519d5cffb2/56351712473.pdf
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_99a0c3f762a541d28244ba81990abef0.pdf?index=true
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_710dd62f74384ae082ee9079db3c4bd2.pdf?index=true
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_59f65ca6814d4e05b96481796c2e79bc.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_off0000f8f8.bin
9d06714399d465736d2fcb07f03fe304a082a4078c7ac4a0388456e21b3ace80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 5180 bytes
font_01_sfnt_off00010ac1.bin
ce710c08f02d66bf501cdd10b46250d3be116838941a5cdc08c506a4c1156f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 10996 bytes

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