Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a837e568bfdabc9…

MALICIOUS

PDF

84.4 KB Created: 2021-04-04 17:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 260ecdd3d79255cfb2115f231b2f14d2 SHA-1: e6c7e2a793e3f9eb8a7bb8a241e0ff17983b6cdb SHA-256: 6a837e568bfdabc96dea604e4a7d624660fa30d8eb52cee1af264659af0766a6
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, including a link farm to SEO-optimized PDFs, and one of the primary links points to zajinet.ru. The document body, though heavily obfuscated, suggests a lure related to an 'immunization schedule'. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=nigeria+immunization+schedule+pdf
    • https://mozabedo.weebly.com/uploads/1/3/5/3/135323929/933eb.pdf
    • https://cdn-cms.f-static.net/uploads/4427523/normal_602dd55502262.pdf
    • https://cdn-cms.f-static.net/uploads/4501029/normal_5fe9a5cdc47f6.pdf
    • https://xopapirepukonut.weebly.com/uploads/1/3/6/0/136053795/152af6ecfc5c6b.pdf
    • http://xokesate.22web.org/what_time_do_the_nail_shop_open_near_me.pdf
    • http://nepifenimet.iblogger.org/surah_al_waqiah_merdu.pdf
    • https://cdn-cms.f-static.net/uploads/4444649/normal_601515c402488.pdf
    • http://doporem.22web.org/is_nissan_service_open_today.pdf
    • https://zexawowa.weebly.com/uploads/1/3/6/0/136081798/9463721.pdf
    • https://puvukiroleta.weebly.com/uploads/1/3/1/4/131455247/jetosol-desomunerile.pdf
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/rivum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d5291910-6b93-4a0a-9e8a-42b1306249bd/zelibeduvafilenumededi.pdf
    • https://uploads.strikinglycdn.com/files/c5bee0d1-cc8d-4503-a67e-42011166c579/jesaxitamisad.pdf
    • https://s3.amazonaws.com/pozokimepe/kukewufubomimowuzu.pdf
    • https://s3.amazonaws.com/kelageketisefuv/19203403563.pdf
    • https://uploads.strikinglycdn.com/files/32982a20-45c0-4aa1-94cd-4679b6e0bd15/college_algebra_test_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/6f65e7c0-9e41-43c4-a089-38f0192a8e49/reading_comprehension_strategies_for_adults_with_adhd.pdf
    • https://s3.amazonaws.com/numunenoji/is_massage_good_for_metatarsalgia.pdf
    • https://s3.amazonaws.com/fujadabez/chromecast_app_for_ipad_free.pdf
    • https://s3.amazonaws.com/dukexajuj/tomoga.pdf
    • https://s3.amazonaws.com/jinotugiwomo/synco_jorge_baradit_gratis.pdf
    • http://wapuzega.rf.gd/68014289239.pdf
    • https://uploads.strikinglycdn.com/files/693b70eb-6bf6-4ecb-b327-a6aed10bc476/ruger_p95dc_sights_upgrades.pdf
    • http://gedonisezif.epizy.com/hempadur_avantguard_750_datasheet.pdf
    • https://s3.amazonaws.com/gofiguj/the_most_common_mistakes_in_english_grammar.pdf
    • https://s3.amazonaws.com/xeruxaxer/bestanden_delen_android_ios.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_off00010944.bin
7976fe134589be2e5ac236bfaa652ef2c37c56f161e621a3364c8cbd592b7a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 5588 bytes
font_01_sfnt_off00011c31.bin
3f9d938bdeba3e032e018a5189eca92aaddb4c1ff10b8fe3bbed17f0db9dfdfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 11168 bytes

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