Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbb456580e559e4…

MALICIOUS

PDF

103.7 KB Created: 2021-02-09 09:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fe57f1e46038e61e34eeb6f0ced54aeb SHA-1: 58b5fe816fbbf3e574d94e49e78057d7355ff8ed SHA-256: 3fbb456580e559e422d7c9e4d7fea174bab3b741527453d41ddfba92efd6089d
146 Risk Score

Malware Insights

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

The PDF document contains a link that directs users to download a cracked version of 'internet manager 6.35'. This is a common lure for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a trojan or other malicious payload. No scripts were extracted, but the embedded URL is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://seumenha.ru/wb?keyword=%D8%AA%D9%81%D8%B9%D9%8A%D9%84%20internet%20%20manager%206.%2035%20crack PDF link annotation
    • https://cdn.sqhk.co/denepepunuja/jbjghhf/dopeputupiralupasenulad.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/9528320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5fce5d990686d.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/gchhTe1/62566372329.pdfIn PDF document text
    • https://silodadut.weebly.com/uploads/1/3/2/7/132712229/fezepuku_kufedujasa_pivefijoposu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5ff5e3fb1cac0.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/serakobuzas.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/4da7691cdca597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_5fd36cb3ab950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lakadutof/bafinolaxul.pdfIn PDF document text
    • http://xesovukefezusag.rf.gd/56500101159.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/62169942145.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/airtime_rewards_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/43329138034.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/flutter_auricular_definicion.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000157da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x157DA 31516 bytes
SHA-256: 27aab9d08665bd7c8df588be3ed3d9a8fdb28135f0b392c9bff9061ee6bbaa91
font_00_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 5352 bytes
SHA-256: 3f7c8e529df5eb0ea0a00802f3d3ce2ae9e97a8c1f2512237bdf7bcdd09f40ad
font_01_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 10844 bytes
SHA-256: 7ef5474bac4fa8bece4586af2c8e9e79d67aaff58492f8c11e442be1a56773d7
font_02_sfnt_off000140a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A7 16668 bytes
SHA-256: 084d80ebff8c2e9a019b0c2ab9e055d7e1d966b2a08b51a20281dfe316318d65

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