Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3234abb36e64ab…

MALICIOUS

PDF

74.3 KB Created: 2021-02-11 15:09:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ef628c3e9e7a89d4d07184afda629670 SHA-1: bacf7361f212cd53dcb9f1825623f5d9d3706e68 SHA-256: 7c3234abb36e64abba166d2cc2a99882568baf0ad18b85c089964e2bdce4d240
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded URLs, many of which point to disposable hosting or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

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://druttle.ru/123?utm_term=how+do+you+say+she+is+very+beautiful+in+spanish PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409421/normal_6011d345f1b5c.pdfIn PDF document text
    • http://hrushch.space/588097374964iys5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5fda7562abace.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/lokurutuxipagev.pdfIn PDF document text
    • http://italiahot.space/guideline_stroke_20194e51k.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/0eb36d871d57eea.pdfIn PDF document text
    • http://jusefaw.22web.org/41294201523.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/gegeu0g/mxr_10_band_graphic_eq_settings.pdfIn PDF document text
    • http://tumerasiwabuzip.22web.org/86941768515.pdfIn PDF document text
    • http://inostrana.com/56225603504335fv.pdfIn PDF document text
    • http://hookup755.fun/rukedozitufasaxisijasovimp0s3.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/baby_cot_mattress_fitted_sheetlx8av.pdfIn PDF document text
    • http://cactusvpn.live/game_of_thrones_season_5_trke_dublajbr994.pdfIn PDF document text
    • https://cdn.sqhk.co/furikute/ihigTOq/piano_tiles_game_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495409/normal_5fcff63985f84.pdfIn PDF document text
    • http://fb-ig-violation.com/jekobanuvofuxixirevop4giyk.pdfIn PDF document text
    • https://mojavewebodaraz.weebly.com/uploads/1/3/1/1/131163943/jidejasaxelegifijes.pdfIn PDF document text
    • https://kajabukege.weebly.com/uploads/1/3/1/3/131379037/bbd8cd5fcd64d.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/hdVhe4C/grim_clicker_chest.pdfIn PDF document text
    • http://compte-cmbretagne.best/jailbreak_4._2._1_without_computermlq48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koluriv.rf.gd/ninofar.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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 5484 bytes
SHA-256: ab8c72d0322268694598e172c8bdd4706d180e8284c7a30d9164997f342cdc06
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 11524 bytes
SHA-256: b0213a071e9479d88a61b451790d9eb5e79afaadf9f9b7e0b4a7749a94a245be

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