Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de7a0cef5435926…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 20:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: caa6bdbc6eb0626b4539814ee408bdd7 SHA-1: 9ca1d5d8384ce926561a3b559875535fb2c13938 SHA-256: 1de7a0cef5435926010d1865299421be476f8256170a1c7e559ee98724e6643b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://midufefew.ru/award?keyword=bolt+size+chart+pdf PDF link annotation
    • http://sugewute.22web.org/26112550420.pdfIn PDF document text
    • http://osthondroz.com/genki_answer_key_first_editionaf4to.pdfIn PDF document text
    • https://cdn.sqhk.co/fabavukunatu/hAMjc6q/dog_fighting_ring_busted.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/Yjiiijf/free_stuff_near_me_craigslist.pdfIn PDF document text
    • http://mnatural.space/sdg_goals_and_indicators2w0q2.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/E9gd0VL/39491550028.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/hiciejb/jujog.pdfIn PDF document text
    • http://icub.tech/842327963379ope9.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/hqDjcgg/kirovixirajunizofirabu.pdfIn PDF document text
    • http://safetymirrors.xyz/26208342905qntob.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/jixeremipet/how_to_say_care_center_in_spanish.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/one_piece_binks_sake_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/fegulijimaxezuleravero.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_2daeb969978a4c5aa0e642abd43b7c46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/22194156480.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_f7b82c993c9e49ad879f191f16f8eb7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/aroma_rice_cooker_arc-_363ng_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/73375529325.pdfIn PDF document text
    • http://daforewepon.epizy.com/what_roomba_has_mapping.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_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5344 bytes
SHA-256: f894e62ced9473f505c4e40b7e7ce2d6afe08ba2e1a0ee516c7df2e669623827
font_01_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 10844 bytes
SHA-256: 6c25e127604954f73462d45f02652d9e1028be2c012de6abca76a0804aa5ea0c

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