Malicious PDF — malware analysis report

Static analysis result for SHA-256 56dcc2d1bd33bad7…

MALICIOUS

PDF

73.7 KB Created: 2021-04-09 21:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab8528d293e40fa29ebf17c75d755905 SHA-1: 218aaf2c023f4a8d5bbe9bb44ba557843775c8f5 SHA-256: 56dcc2d1bd33bad779900227a88ea417a40ebce0c318e99b330fb9d2c4d2821c
166 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of 'cmd' in the document text, alongside URLs, indicates an attempt to execute commands or redirect users to malicious sites, likely for further exploitation or credential harvesting.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nipisod.ru/strik?utm_term=how+to+check+serial+number+on+laptop+using+cmd PDF link annotation
    • http://dubunidenore.iblogger.org/zuxik.pdfIn macro / runtime command snippet
    • http://medgaj.com/3831207338qowj3.pdfIn PDF document text
    • http://montana-media.com/68047461771kxtph.pdfIn PDF document text
    • http://notdull-eng.online/xabisiwigajqsns7.pdfIn PDF document text
    • http://legko.travel/hp_deskjet_2131_wont_printkqboz.pdfIn PDF document text
    • http://tudetiva.iblogger.org/reported_speech_mixed_exercises_doc.pdfIn PDF document text
    • http://premial.su/59317092385kgy7l.pdfIn PDF document text
    • http://sadovik.me/jupejovikigr2of3.pdfIn PDF document text
    • http://dominis.xyz/99748896625auqjt.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://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_03a7e30ca3134722b5759c8a4d845617.pdf?index=trueIn macro / runtime command snippet
    • http://gutazajegexu.rf.gd/present_continuous_affirmative_negative_questions_exercises.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_edbb081f54f94ad9bbd9659341ecae53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2ad81a-be76-42ee-b238-bada6daa1ab3/i_am_the_word_paul_selig_download.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_1ff691107a344e9b829614a6fff9419f.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_900bb39ced4047279ca2b01cc4dcc1a1.pdf?index=trueIn PDF document text
    • http://sezulezaba.rf.gd/fuwaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac1b765-de85-4ee3-9e33-26e7636e61a3/soccer_resistance_band_exercises.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_4c7f6f99b955461bbfd5dc404fe65de3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed22383-7396-42ee-8594-3c68704f9d5f/what_book_comes_after_a_court_of_mist_and_fury.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_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 5628 bytes
SHA-256: 3db16083ad32a656fdfb5ac9794a14d56efc736d67d59f1924788bb0a4f91084
font_01_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 9968 bytes
SHA-256: cf5e335b9170edee75d1c4fc43c1c740dff6c3f5ad4d8e2dbb5e2ecaa447ae16
font_02_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378