Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec7576e7f45f475…

MALICIOUS

PDF

91.1 KB Created: 2021-03-17 10:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86339dd2fe4003a14dfeb23350736ec SHA-1: a2f825a45adbaa84783bf08d47d6508f8c6bd0ff SHA-256: 8ec7576e7f45f475fb747f2336aa4c61f053a85a16051c020c93f4a53156af4b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, with one prominent link leading to a URL that appears to be part of a link farm designed to mimic search results for educational materials. The document body, though heavily obfuscated, contains text related to "Houghton mifflin math answer key grade 2", suggesting a lure to a fake educational resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=houghton+mifflin+math+answer+key+grade+2
    • http://jevopapivixepe.iblogger.org/rizavigidizumaraxawejoraw.pdf
    • http://finomimetafix.sportsontheweb.net/69794919087.pdf
    • http://rixujewo.getenjoyment.net/whats_in_dominos_garlic_and_herb_dip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jekowatu.epizy.com/57726289261.pdf
    • https://s3.amazonaws.com/kefiperizonofu/zanosusarovonokiluridere.pdf
    • https://uploads.strikinglycdn.com/files/e67f335d-def2-43cf-a652-8e5a72e39f52/2013_dodge_charger_rt_specs_0-60.pdf
    • https://uploads.strikinglycdn.com/files/31cb7f89-ec5d-4015-b1ab-946943625a4c/pumptrol_pressure_switch_wiring_diagram.pdf
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_123b13e437a0485a9110d21574b41a53.pdf?index=true
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_cb1363cef79c4b649032e553278b2bed.pdf?index=true
    • https://s3.amazonaws.com/vuforewebub/4866605823.pdf
    • https://s3.amazonaws.com/vuforewebub/42493007278.pdf
    • https://uploads.strikinglycdn.com/files/cc64d49d-adca-49d0-917e-8ebaa4d08347/31910658838.pdf
    • https://uploads.strikinglycdn.com/files/ce46cf02-29a1-4c4c-bef2-f3dae0162b21/dvdfab_10_64_bit_crack.pdf
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_4b205126bbb34335a2cdcf631d304e03.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c65a994e-19a4-4f0c-a3bf-bde331f31f09/how_do_you_know_if_your_car_is_running_rich_or_lean.pdf
    • http://tewidunutazi.rf.gd/world_s_hardest_math_equation_with_answer.pdf
    • http://pazugovaru.rf.gd/free_acsm_cpt_practice_exam.pdf
    • https://uploads.strikinglycdn.com/files/12f8552c-6b24-4f7d-9ffe-fcffd475765d/tototikep.pdf
    • https://s3.amazonaws.com/divikufifir/enrolment_form_template_word.pdf
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_49793509a04b413ba2d4523435dd6bdf.pdf?index=true
    • http://gariravufur.epizy.com/lofomelakuvexog.pdf
    • https://uploads.strikinglycdn.com/files/b690c1df-163e-4260-ac6e-73b0d8ec4557/five_nights_at_freddys_3_song_1_hour.pdf
    • https://s3.amazonaws.com/zarevizebi/how_to_do_ppt_presentation_in_google_meet.pdf
    • https://uploads.strikinglycdn.com/files/ac0d212c-1126-4a43-9fb6-632e1cdfbc26/how_can_i_track_my_american_eagle_order.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000132e3.bin
957355c08eea5eb9a5a0464226a1ce6ba4254160f44917fdd0d2d9f70374bc20		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x132E3 23304 bytes
font_00_sfnt_off0000fa84.bin
bbf551bede0824ad259bd2509549617e6367c8460e392ca1ade81664ad4a32f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 5672 bytes
font_01_sfnt_off00010dbc.bin
ad94467498da580d5282919583f862afaa5c495d39a392c56719297b5385a3c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 10992 bytes

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