Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c0b2dad1fbf17c…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 23:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9ca679a4933ea4bdaa293effebdc3afe SHA-1: a2239d27031ccce1409b24bf24520da2ea3add0b SHA-256: 26c0b2dad1fbf17c9e9961d9006f617c7a1ed869cde83aca9f381437bc2eb9c6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, with the 'Pdf.Phishing.Trojan' signature suggesting a phishing or trojan distribution purpose. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=best+outdoor+helicopter+remote+control', likely serve as lures or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=best+outdoor+helicopter+remote+control PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424036/normal_6004be42a6122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd64205957b9.pdfIn PDF document text
    • http://xovitexi.iblogger.org/exploring_psychology_in_modules_9th_edition.pdfIn PDF document text
    • http://ritibaj.22web.org/zoketazelemabugemalo.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://uploads.strikinglycdn.com/files/971f407d-43e5-42ed-9484-2bafd51a9c9c/gefavejubojilapanifexij.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_a1f038eff93940c58aff3ffd45030867.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_62074e4b12ff4b99a51f546f1bd20f16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/holographic_will_formalities.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_74ec81ea1db54d408f95b07981a56b81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/wubemudimexebiso.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_501d53e08ea94fc198db41af4040ab2b.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_0817b3808f44425aa0fc70be9fa12feb.pdf?index=trueIn PDF document text
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_0b8f14868b574ae09d192fbd0e52914e.pdf?index=trueIn PDF document text
    • http://pazawidef.rf.gd/biw_fixture_design_tutorials.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/d_link_camera_dcs_5222l_software_download.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_f21e223f290045f882491536c7ba3433.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1277c3-2e9a-481b-8fac-855fea525d90/5950211334.pdfIn PDF document text
    • http://gatinilub.epizy.com/dusirekomobujuvorefotada.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_456633e98505440db0a77f16b5490a34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/48147910174.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_aeeb40b7231445d2a0d63ddf4b653ba8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/alzheimer_s_disease_powerpoint_template.pdfIn PDF document text
    • http://gozixug.epizy.com/steve_hartman_on_the_road_secret_santa_2020.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_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 5032 bytes
SHA-256: af1201461ffafb8cd5d2afd771840b8448f7ebc1aba0b253a2d4ac9dde838700
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 10776 bytes
SHA-256: 8f9220cc0bef9bcc72571b766412ba64bea81d62191ce4d9730045bd4f75719b
font_02_sfnt_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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