Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a09c60913b8239…

MALICIOUS

PDF

81.7 KB Created: 2021-03-21 10:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1d4788a37f80ed64592368cdad074a46 SHA-1: b77f9ecccb3c3a74e5bd502729108bb3b5c41359 SHA-256: 99a09c60913b82395878ac98c34d81c271335be3b3d5d51fc7110d3f458e8390
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://resalured.ru/award?keyword=advanced+excel+tutorial+free+pdf PDF link annotation
    • https://cdn.sqhk.co/kizafizutuw/jeLheid/quick_school_parent_app_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/todezuzutito/VoW6hgd/backgammon_how_to_play.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/4137504.pdfIn PDF document text
    • https://vesetiwavulajed.weebly.com/uploads/1/3/1/3/131381055/tomeromebo.pdfIn PDF document text
    • http://com-signto6.xyz/how_to_play_the_game_of_life_gameeen8x.pdfIn PDF document text
    • https://cdn.sqhk.co/milasutepi/KZgigjc/zed_runes_ll_stylish.pdfIn PDF document text
    • https://bisimopax.weebly.com/uploads/1/3/0/8/130814127/rasugeveroruxesarume.pdfIn PDF document text
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/518294.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/jcibjiY/83327092505.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/rjhidb9/free_wallpapers_for_iphone_6s_plus.pdfIn PDF document text
    • http://barbanapoli.moscow/bolamezubps5og.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/l9idCXL/2_week_weather_forecast_ocean_city_nj.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/2176256.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/pYhdZii/vlookup_data_validation_from_another_sheet.pdfIn PDF document text
    • http://bogplaktnc.fun/61434377849fmb8j.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/paropabaru/backuptrans_android_viber_transfer_registration_key.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/biochemistry_books_satyanarayana_latest_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/invite_to_lunch_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb7fc4c-ff35-4e50-81d5-b37b88aa7b52/fuzuwovekikidaxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3faccc4b-4ba0-4cd7-aacc-38f3bdded0b8/shatter_me_series_box_set_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/synonyms_and_antonyms_with_bangla_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/bahubali_1_cinema_telugu.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_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 5088 bytes
SHA-256: 0a5af4e70a51c23083179dce749346dec32b4cd03ae60ab8a33f371f245ba258
font_01_sfnt_off00011446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 10424 bytes
SHA-256: 4261c284cc56aabc14c7bb9c147c7d35e0117198518a5b2a143d916fa1b9774c