Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f623e3a02d13d1…

MALICIOUS

PDF

86.6 KB Created: 2021-03-24 06:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c915c4d9ee1fc29104cd92a4621c635f SHA-1: ab62fc34c8fb4e19b938ed2adfbd948bea246d5b SHA-256: 61f623e3a02d13d1349db47a53280a199e09aaeae3935e4c2b32163300790f7c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various domains. One such link, https://midufefew.ru/award?keyword=javascript+tutorial+pdf+full, is explicitly flagged. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/award?keyword=javascript+tutorial+pdf+full PDF link annotation
    • http://loziwazekon.medianewsonline.com/16751275474.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/reliance_606_gas_water_heater_thermocouple.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/h5Cjhhb/49819694430.pdfIn PDF document text
    • http://iglivesupportteam.com/20920398181ukpo6.pdfIn PDF document text
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/2921916.pdfIn PDF document text
    • http://pinenud.mygamesonline.org/xebiwuvawibozis.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/diary_of_a_wimpy_kid_the_third_wheel_full_audiobookt6bbh.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/eGhigcv/crewe_tractor_auction.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/3soiiR4/rutefubuliduf.pdfIn PDF document text
    • http://capridigi.com/what_are_the_five_characteristics_of_romanticismzpn1u.pdfIn PDF document text
    • https://waliruwixogipi.weebly.com/uploads/1/3/4/0/134016871/8f340f0d5e01a.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/wosow.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://s3.amazonaws.com/julexekubaj/5087335404.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/82554092816.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/lusogusowiwire.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/how_to_get_rid_of_flabby_arms_with_resistance_bands.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/5222158677.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/59459309677.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/63311692508.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/how_to_add_a_swipe_up_link_on_facebook_story.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 4856 bytes
SHA-256: 68f9f4b7a4084008f3604bbcfc40ad4bdd407e4f98c89df02cfbfc1f127bc25f
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 2332 bytes
SHA-256: 2803e4ab06345ba466320c57d9286f62181b5816a6bcbbfb76de200d44345203
font_02_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 10448 bytes
SHA-256: a699c2ffed5adfc97f9495cdbd1b7530581d63c0cde33122f5cde25673e11abe
font_03_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 16328 bytes
SHA-256: 68fb388c6b89fa332810f41b5bb86928254c5d182ee1207b277fc27fe5f5d1eb
font_04_sfnt_off00013e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E05 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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