Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4597809860882b…

MALICIOUS

PDF

118.8 KB Created: 2021-03-16 09:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c0dad4078caa4d598841312863609c8b SHA-1: f958b5f8c0509e8a283244101578a1d0157bfa7b SHA-256: df4597809860882b0ff9577ebb4a487dd98b72d7892b58c69239b4576f9881a4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate academic content, but lead to unknown or malicious domains. The 'SE_MFA_LURE' heuristic indicates a strong likelihood of credential harvesting or session token theft. ClamAV detection and ML classification further support the malicious nature of this PDF, likely serving as a phishing lure or a dropper for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://nipisod.ru/123?utm_term=academic+benefits+of+studying+abroad+pdf PDF link annotation
    • http://worozoxiw.sportsontheweb.net/stepper_motor_actuator.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/99998079857.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/cf911cb7c0f1d3.pdfIn PDF document text
    • https://jugovufepejeja.weebly.com/uploads/1/3/4/6/134611134/lodilafunozaj.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/is_the_nook_tablet_worth_it.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/c0ccc.pdfIn PDF document text
    • https://bapumora.weebly.com/uploads/1/3/2/7/132740837/zejisadutuzowan-vikebilajon-jotaruw-wugubewij.pdfIn PDF document text
    • https://jumewabob.weebly.com/uploads/1/3/0/7/130775497/nuxesofezoxaxed.pdfIn PDF document text
    • https://kirejoji.weebly.com/uploads/1/3/1/4/131483098/7187075.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/212c03ba-5667-4faf-bd3d-664210d28d53/god_chasers_tommy_tenney_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/40216733836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df20382f-53ac-4fec-ba3b-3b8342c171ed/la_la_land_last_song_lyrics.pdfIn PDF document text
    • http://nijarigu.onlinewebshop.net/mamefegijobeporotur.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/alumni_singular_or_plural_nouns_exercises_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/55456833770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955573e3-3327-4acc-9918-79c011e7ab47/visual_pleasure_and_narrative_cinema_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/how_to_run_a_weight_loss_group.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/wawuginupixidokofud.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 55508 bytes
SHA-256: 065464ace9a9821eeb79348ae41511380b276b59563fe9f786ee79b9f13e8b21
font_01_sfnt_off0001928e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1928E 5672 bytes
SHA-256: 4931dfa289cdfe22a0291fbae0b7d7b34cba81ec8a4a355a9ccc4f64c815f695
font_02_sfnt_off0001a5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5D0 12632 bytes
SHA-256: 2253b72c52b2bf69a9632248c9a9142ea9c0416354bb85b4f131ae2095dc073c

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