Malicious PDF — malware analysis report

Static analysis result for SHA-256 33298e2b81444642…

MALICIOUS

PDF

86.7 KB Created: 2021-03-25 17:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c68a44cd9aff6d08b0ddacbfb7fe915f SHA-1: 197bc5ee687f225e4d948b5f0044de4929ed0231 SHA-256: 33298e2b81444642e72e2741baab1b560184dc26d5c4ac87b994d7c71732b7e3
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic and the presence of multiple suspicious URLs. The ML classifier also flagged it with high confidence. While no scripts were directly extracted, the document's structure and embedded URLs suggest it is designed to trick users into contacting malicious actors under the guise of resolving a fake issue, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zajinet.ru/123?utm_term=jsc+result+2018+bd+marksheet PDF link annotation
    • http://ig-supportcenter.xyz/best_english_grammar_book_for_esl_studentsylrf5.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/kisesenokikov.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/capsim_for_dummies_2020.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/bihar_daroga_previous_question.pdfIn PDF document text
    • http://silkhfig.bid/why_is_my_whirlpool_oven_not_heating_uphpfhj.pdfIn PDF document text
    • http://datingdate.site/36754535142329eu.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/bujanigumedepuj.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/63483657168.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/35144094519xsz60.pdfIn PDF document text
    • http://maykistore.ru/bhojpuri_song_latestay6z1.pdfIn PDF document text
    • http://italia-doc.fun/5_paragraph_operations_order_marine_corps07uod.pdfIn PDF document text
    • http://domotoj.sportsontheweb.net/somewijedezarogetimiluj.pdfIn PDF document text
    • http://edevletorg.com/in_the_heart_of_the_sea_cast_weight_loss5wn45.pdfIn PDF document text
    • http://vwwv-avito.online/451305631669mer6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_faeb221cf341433b82b8ee01dbd495cc.pdf?index=trueIn PDF document text
    • http://polilofu.onlinewebshop.net/star_wars_thrawn_ascendancy_book_1_chaos_rising.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/cisco_3750-_x_datasheet.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_2067cd1e322a450188574f5c1afb1a74.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_6154fe7e409245a38d9720ffd4371849.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_9afd7edda21748de880e51c8c5018aa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/kusaworaxoru.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_e624c6b28a9a45cd983b2d281e3a9f25.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 5512 bytes
SHA-256: 9842393e218c3494113a039ed6a585c3bbe847b3bb0ed015d11e422624478974
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 5316 bytes
SHA-256: 7f8d9ab52e97014ae29c1b2c10b7d946705b23050da455ebd714248cf5927542
font_02_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 10948 bytes
SHA-256: 64475a941ebd0b24d611160ade950916a8ce9628ddbeb85ecbd942cd236c9eee
font_03_sfnt_off00013ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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