Malicious PDF — malware analysis report

Static analysis result for SHA-256 df58aa79351dce00…

MALICIOUS

PDF

79.7 KB Created: 2021-03-28 10:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f146947d7e50e73ae97ea839097dcd4b SHA-1: 1a33d43ada414d1aec105f502ccfbf4a69a53fba SHA-256: df58aa79351dce0036dbcb8dae16caaaf66cd6a0901fd2539859c8dbc967687d
166 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm on disposable hosting and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Factory reset apple watch manually'. The presence of external URIs, particularly 'https://pelibifir.ru/123?utm_term=factory+reset+apple+watch+manually', combined with ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', strongly suggests a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/123?utm_term=factory+reset+apple+watch+manually PDF link annotation
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/relareb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_6056d9c44541a.pdfIn PDF document text
    • https://pexarokozisakim.weebly.com/uploads/1/3/5/3/135313666/nomapuzixulu.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/nazugug.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/polosowutebuburukatobaz.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/moxalonajojewebajup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_603010d57a281.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/4795245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gazivemon/ielts_writing_task_1_topics_with_answers.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/jeloxogajekepim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efc1d7f-83e0-4635-ac02-07eb24372c7e/jeseb.pdfIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_3c18d60a1bb942618e8e5495d21cbb90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/875fc304-9fe4-42e9-99e9-a59794932a18/the_game_awards_time_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a3cb2c-fce4-4755-b155-afe88df60ed6/bose_companion_2_series_iii_multimedia_speaker_system_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/nigudujarovekimafe.pdfIn PDF document text
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_6847df229d034368a3e13b71a0019e96.pdf?index=trueIn PDF document text
    • http://sutexuvidag.myartsonline.com/masatafejazazijuxumo.pdfIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_eb9d8188eff447a4b19428b0bf4d12ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/ropolugaxumupelibewulut.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/the_elder_scrolls_v_skyrim_special_edition_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/setting_wireless-n_wifi_repeater.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_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 4308 bytes
SHA-256: 0cef62d9c0b2dc7b1d0c57f99e6c49354cf4cf695043dd65dca508269b7d2358
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 5324 bytes
SHA-256: 3d73cb72d68707a428c6c2718314896712e4733259cfe50de74b56dc186df671
font_02_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 10744 bytes
SHA-256: 2079ca5601215ff3e6b4fa6288ef4994b36c4918eda907a96e2e3e2a56377539