Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1b607a335822c8…

MALICIOUS

PDF

83.2 KB Created: 2021-04-06 17:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a26f09df6ba2c063b6f3d26d7ec79e03 SHA-1: 208a25113cd8f2546065677265e34353987b4667 SHA-256: 2b1b607a335822c84718ebf8047a1e919185ce4bfd62d7a48d885c906c8a37e5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically to appear as a search result or similar lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://bologen.ru/strik?utm_term=garmin+vivofit+4+replacement+band+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448096/normal_6037b7772defa.pdfIn PDF document text
    • http://nat-yoga.space/boruit_rj-3000_led_headlamptzrb8.pdfIn PDF document text
    • http://tk-time.site/sword_art_online_alicization_rising_steel_tier_list252cj.pdfIn PDF document text
    • http://disconto50.pro/cambridge_checkpoint_science_past_papersj102g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_605179ef1de78.pdfIn PDF document text
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/wewaju.pdfIn PDF document text
    • https://cdn.sqhk.co/wemojezuvegi/jha1Sih/39504815544.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/gdjiijv/cake_cutting_comb.pdfIn PDF document text
    • http://creditactive.info/copy_paper_a4_80gsm_white_500_sheetsj9ukp.pdfIn PDF document text
    • https://cdn.sqhk.co/mejiwimuza/atyigjb/23998437652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457014/normal_6060127d4b614.pdfIn PDF document text
    • http://instapriz365.online/wixakapejatekagasetuo64k9.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/Hhafche/realm_runners_endless_maze_runner_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_604ba7dea9240.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/2502569.pdfIn PDF document text
    • http://max-lifting.store/70392724250s87fv.pdfIn PDF document text
    • http://itnegozio.info/811336459716lh8m.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/4RhdEhc/guitar_hero_vs_rock_band_drums.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f90f26-d414-4262-9cb0-19da971a73b8/92382610773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ba46ec-e49e-43ff-b6f4-e3c9286cbcbc/craftsman_14_inch_electric_chainsaw_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463902a9-d578-4ca3-b73e-db8d9506c18e/oracle_19c_virtual_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b88cbe2-1a87-4449-9804-38112e276d9c/1800_toefl_essential_vocabulary_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 5620 bytes
SHA-256: 18e0619a07cc45c8bc8a30060eb4a31e9fc4cc9cada0f397d8b6ffc1d07388ad
font_01_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 11632 bytes
SHA-256: af449f9728d73f79807b2c81d3f611d4bfffdc898a4443776d8795beb982b33a

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