Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5d49fd65579cf4…

MALICIOUS

PDF

106.6 KB Created: 2021-05-07 00:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fd8711bc25356fd38410a77645729921 SHA-1: d53fa5e3ec2ddf0ef21187f2748467c621186de7 SHA-256: ca5d49fd65579cf41fa254ee05e5286eb5ba5f73729eeaace6d613e70a2f5048
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating phishing and trojan activity. It contains numerous external URIs, with one prominent URL leading to a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The document body, though heavily obfuscated, appears to be a lure for a wiring diagram, likely to trick users into clicking the malicious link.

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 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/strik?utm_term=12000+lb+badland+winch+wiring+diagram PDF link annotation
    • http://kipegujodup.getenjoyment.net/lysogenic_cycle_of_lambda_phage.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/9th_grade_biology_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/ghwgilJ/disney_account_login_issues.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/rofipugorimedines.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/arithmetic_sequence_practice_problems.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/makalah_cacar_air.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/eghhvhd/child_care_resources_ocean_county_nj.pdfIn PDF document text
    • http://derifupiwa.mypressonline.com/toxinas_uremicas.pdfIn PDF document text
    • https://cdn.sqhk.co/zuboxizip/chDNFvj/nujib.pdfIn PDF document text
    • http://sakepugikunon.mypressonline.com/per_la_gloria_d_adorarvi_giovanni_bononcini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/software_testing_and_quality_assurance_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3adb4fbf-69b8-4919-ad12-5170f9f0b99e/why_is_my_hot_water_dispenser_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6adb4e37-862f-445b-81d4-08fd176c42b2/badirozotovadit.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/why_do_songs_disappear_from_spotify_playlist.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_587027e3d880408d80c743277e1fe90b.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_3629d4530925497aa6cd6449995128d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e9a511-a08f-4315-b2fe-b9a07ada40c6/25531528727.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_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 41980 bytes
SHA-256: 1d2d62c968960a8a01e5d585ed03ca354570911b7baeb1bbd515e8255ddb1da3
font_01_sfnt_off000165bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165BB 5640 bytes
SHA-256: 8894463134d29048c3bf9acf2a47f912e17666da73b1aa515ee42dbaa22dc81c
font_02_sfnt_off000178d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D2 10560 bytes
SHA-256: c1b63c9219913d3994dd8825af468d89362cfada740541feca17d1d13c69122f

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