Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d66932b66f7c82…

MALICIOUS

PDF

86.3 KB Created: 2021-03-28 14:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 895dfbf2425c4e9b1b4e0b7706cccfd6 SHA-1: b220d6b48b4e31e97f7c96458bdd47dd088efbb0 SHA-256: 18d66932b66f7c8290bf64bbad571a6d1e2c49d36b96e0d053cd5ba052939a3c
156 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://zajinet.ru/wix?keyword=star+trek+technical+manual', appears to be a lure to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=star+trek+technical+manual
    • https://cdn.sqhk.co/nezuxada/gcCGhe2/dhaka_university_admission_2017-_18.pdf
    • https://cdn.sqhk.co/bewewojiwo/3gd5hjS/joxewaxisilunotobozibo.pdf
    • https://cdn.sqhk.co/fosasukenum/giejjhe/black_friday_iphone_deals_2019_uk_apple.pdf
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/069fd8ebcb3.pdf
    • https://gusagipo.weebly.com/uploads/1/3/4/0/134017144/siwomumewewegigi.pdf
    • http://jabilevij.mypressonline.com/arihant_ethics_book_download.pdf
    • http://lirinevewafa.mypressonline.com/77947262768.pdf
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/viluf_dinesurutoteri.pdf
    • https://cdn.sqhk.co/gudopokobipa/bQnRheP/sonic_the_hedgehog_classic_adventure_download.pdf
    • https://cdn.sqhk.co/zarejesorufo/eyjajdV/diversion_definition_oxford_english_dictionary.pdf
    • https://cdn.sqhk.co/dobajinorite/YaidAjO/mepelozaliforarizaja.pdf
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/d7c92eb.pdf
    • http://rasipafus.getenjoyment.net/93773326088.pdf
    • https://cdn.sqhk.co/gogojelawov/MMjaZgf/billie_eilish_wallpapers_hd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/50a0eb46-8465-4766-8c6f-4808d6f99ddd/how_to_learn_fast_rap_songs.pdf
    • https://uploads.strikinglycdn.com/files/50a2fcee-eeb9-40d3-b348-205e36e90473/94755474689.pdf
    • https://uploads.strikinglycdn.com/files/5109507b-61aa-4d81-8ca1-cacf0b76f17b/acer_aspire_v5-122p-0643_battery.pdf
    • https://s3.amazonaws.com/zepifudoxapo/the_stranger_in_the_woods_nyt_review.pdf
    • http://sizemogigu.myartsonline.com/what_is_the_compensation_for_being_on_judge_judy.pdf
    • https://uploads.strikinglycdn.com/files/1f0fe234-b859-4e96-850c-daec3145f882/zixunutuvekojimufawazixu.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/diwawatabamiribisi.pdf
    • https://s3.amazonaws.com/besafefaf/50023564323.pdf
    • https://uploads.strikinglycdn.com/files/ab8ee8af-85c0-48bb-8a1b-dc74b2453c29/52046344694.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116bc.bin
7bfca4997e7c9add6bee38c30950b9aa0ecb8b16fb7e1b767ffab955bc325d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 5028 bytes
font_01_sfnt_off000127af.bin
335bb267504d8da90ec7e18cc4861ba12986f632c8f5e479e5915efab7a78cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 10516 bytes

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