Malicious PDF — malware analysis report

Static analysis result for SHA-256 6384681b71408fc1…

MALICIOUS

PDF

82.9 KB Created: 2021-02-22 07:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bbb220c4a0da2686bd04f7c0bcf205d3 SHA-1: f78c9b94bc6b164ed1336a47667845c38c2db5bc SHA-256: 6384681b71408fc104263553d6e52da5573adfa565979f957c4eafbbe3ffca43
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/123?utm_term=dark+souls+2+how+to+do+jump+attack+pc PDF link annotation
    • https://walamezer.weebly.com/uploads/1/3/0/7/130740591/fegod-vefasa.pdfIn PDF document text
    • http://alex-chekalev.com/38234751762t3m64.pdfIn PDF document text
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/f3516c.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/733086.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/RnmUJjg/how_to_baking_italian_bread_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/bNVhija/31162155317.pdfIn PDF document text
    • http://checkmyscore.info/cg_gali_video_2018az4ga.pdfIn PDF document text
    • http://dutov.org/samsung_refrigerator_rs261mdrs_manuaqf5x0.pdfIn PDF document text
    • http://bestrongbyg.com/zidotesqz0.pdfIn PDF document text
    • http://pixxel.life/chain_reaction_cycles_pro_bike_bagw8vvw.pdfIn PDF document text
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/weborotafilana.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/qhj7Ihh/800_words_cast_big_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/jjjIjeo/viticulture_essential_edition_2_player.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/idjd5vv/55009645052.pdfIn PDF document text
    • http://wovolutoxali.iblogger.org/89877474728.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/jjYigWU/fosesoporuraz.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/wufujudisu/games_2019_android.pdfIn PDF document text
    • http://nafinuxunowu.rf.gd/susifadopajokosofuzosuje.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/dugedopoxosodabuvaxabukox.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/affirmative_tu_commands_worksheet.pdfIn PDF document text
    • http://wusojomirewo.epizy.com/58523864838.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/97763548901.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_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 5676 bytes
SHA-256: 462d8f43c5c48f1a84ee1df29b3f62724e86a2985fdd77d9728f712cf0624ce5
font_01_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 11076 bytes
SHA-256: beaaa1cf485439d3b697e9f68bd36ca86e3386ee413e6addcf0f2b9eccfcd3e8

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