Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f96a91d8238d09a…

MALICIOUS

PDF

97.1 KB Created: 2021-04-01 05:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a0fd32619221859314519c50f26dc811 SHA-1: ed2ebb3c483a2e3fcf2120fe8662ca7b327f1847 SHA-256: 1f96a91d8238d09ad6c6f3aff5b52255c8b1c551c166e0db7d356a612d34c008
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to redirect users to potentially harmful websites. The presence of embedded URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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/wix?keyword=mr+poe+actor PDF link annotation
    • http://xuwivezotuw.22web.org/slingbox_500_setup_with_xfinity_x1.pdfIn PDF document text
    • http://ganexofom.iblogger.org/meanwhile_back_at_the_cross_guitar_chords.pdfIn PDF document text
    • https://pudexaxetodeli.weebly.com/uploads/1/3/2/6/132683251/jelaruma-dezobazoselos-kajivesadatakib-mababuj.pdfIn PDF document text
    • http://vovuzug.22web.org/are_zoo_york_boards_good.pdfIn PDF document text
    • https://nudilosi.weebly.com/uploads/1/3/4/5/134527742/4070616.pdfIn PDF document text
    • https://fawubanine.weebly.com/uploads/1/3/4/3/134321827/7201229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betiravel.epizy.com/fexenuso.pdfIn PDF document text
    • http://dokuzijix.epizy.com/504324379.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/income_guidelines_for_wic_in_tn.pdfIn PDF document text
    • http://basukek.rf.gd/gixibawiruteno.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/bubble_sheet_generator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/37826742219.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/legacy_of_the_drow_siege_of_darkness.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_3fc2cdad92484c4ea6c4eb0d2b647384.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metakibeme/gadekukev.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/chinkara_kinnaram_minnaram_song.pdfIn PDF document text
    • http://sonevusejebazu.epizy.com/vatifilosajojuv.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_c84a5c9a830e45979e1082f437c012bf.pdf?index=trueIn PDF document text
    • http://sukivuserofa.epizy.com/la_boite_a_merveille_chapitre_1_analyse.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/appserv_32_bit.pdfIn PDF document text
    • http://bewululito.rf.gd/66222794196.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 4724 bytes
SHA-256: 009ded511bf3c62dc7cb24b512bb19115f99915de4fcf088a0188a3896641b32
font_01_sfnt_off00014db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB9 12492 bytes
SHA-256: 158493dd712d8a781e4c555f4c5a530060c586563d27901ab65c7bd0fa8659ae

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