Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c45346fb8dd435…

MALICIOUS

PDF

71.0 KB Created: 2021-03-22 18:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a02f5a1d9a6637a8aa03d08f171d7492 SHA-1: ebd6beb0ffcd65735f356c1c01b2fe31931b754b SHA-256: e8c45346fb8dd435ac23fe122f87de17f74e9f49358e8bf67df77d2664f2ba51
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a phishing or SEO spam campaign. ClamAV and ML classifiers identified the PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/123?utm_term=bhoot+fm+3+august+2018 PDF link annotation
    • https://cdn.sqhk.co/dikozogub/figjh5J/moksha_name_meaning_in_kannada.pdfIn PDF document text
    • https://jibukosixej.weebly.com/uploads/1/3/4/0/134018053/5947218.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/ghcjiia/bkash_send_money_reference.pdfIn PDF document text
    • https://cdn.sqhk.co/dugudumopup/hj5VwiL/texas_parks_and_wildlife_outdoor_annual_app.pdfIn PDF document text
    • https://surexirubale.weebly.com/uploads/1/3/4/0/134000129/2229260.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/fiahghi/how_did_you_learn_english_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hahchez/cartoon_sound_effects_wiki.pdfIn PDF document text
    • https://dovomarolod.weebly.com/uploads/1/3/0/9/130969455/5816542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_6056d6f2c36c3.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/gKhh6ii/sago_mini_village_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_60497ac78fde6.pdfIn PDF document text
    • https://cdn.sqhk.co/lezenelu/7fuwKbS/543_isle_of_pines_mooresville_nc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_6052cd7db5290.pdfIn PDF document text
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/sutolisam.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/hdRevih/road_rage_definition_espanol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_cb2e96bf168e4d0db6669922b49eb2c4.pdf?index=trueIn PDF document text
    • http://jekopadifixuniz.epizy.com/1999_sun_lite_truck_camper_specs.pdfIn PDF document text
    • http://rewelopax.rf.gd/vitamin_b6_deficiency.pdfIn PDF document text
    • http://zanutebuxeboluv.rf.gd/borland_c_builder_5._5_free.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_b381f34cb3c649a58a788a0ebf4f9954.pdf?index=trueIn PDF document text
    • http://rimamosapike.epizy.com/99100289509.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_d8c877f6796f46b8acbabcf8379efc12.pdf?index=trueIn 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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 5784 bytes
SHA-256: 3dcef72bca24a8f9a8c5fa36c8edde1bb8e355f5e60d10e6f82d94468c8cc3af
font_01_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 10396 bytes
SHA-256: c350472bdf3394e7b0661a513f096453a542ac9417848384ae5103d67ff82a12