Malicious PDF — malware analysis report

Static analysis result for SHA-256 936023ca316aab49…

MALICIOUS

PDF

89.1 KB Created: 2021-04-12 02:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ee1d606afebb7ac04f273fa65f81da26 SHA-1: 597082165470b4f2da1d725dccf763b601340bc7 SHA-256: 936023ca316aab49b477b4f22febbfba121ffbcbacd475e81e394db8b75bb501
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least two pointing to disposable hosting and potentially malicious domains. The document body, though heavily obfuscated, suggests a lure related to 'flow chart of parts of speech with examples', which is likely a pretext to direct users to malicious sites.

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 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://zajinet.ru/strik?utm_term=flow+chart+of+parts+of+speech+with+examples PDF link annotation
    • http://demumamudu.22web.org/common_errors_in_spoken_english_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/hiHijIS/14739075214.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/gcugdih/heart_rate_monitors_usa_coupon.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/geibjbX/54257097007.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/jeDhhhg/english_audio_stories_to_improve_english_free_download.pdfIn PDF document text
    • http://piwifeg.22web.org/orbit_sprinkler_timer_replacement_key.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/1jhdje8/lopirosusuxokoval.pdfIn PDF document text
    • http://foramodosug.mygamesonline.org/bruchrechnung_multiplikation_und_division_aufgaben.pdfIn PDF document text
    • http://vezemif.22web.org/8738165801.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/weight_loss_diet_menu.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/gujizilitajevorutudube.pdfIn PDF document text
    • http://wonitudigugejut.iblogger.org/fijilasiwenafa.pdfIn PDF document text
    • http://dewiluvafaridi.22web.org/bhajan_songs_tamil_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8202cf-62c7-48ec-a54a-d3e14e1006f0/73891508728.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_d6e1a14e2f30465586a5d981a4a26e2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9761fc7-36a1-4c5a-a0d7-9959a5d686c2/how_to_fix_a_window_ac_unit.pdfIn PDF document text
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_4ba575cc4b7c4f1cb140ac9f23cabbb4.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_d3f49fcb5bef4f0b8960fd1a753dedc3.pdf?index=trueIn PDF document text
    • http://kepagewav.atwebpages.com/paxuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd71c827-4b69-429c-aabd-74c421d98e7d/dasow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bd6610-d89f-4552-9979-49536e375266/37871310686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382053ae-37c2-4716-882b-9abb233035c4/84963666854.pdfIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/flash_actionscript.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_3e6187a208144201b81655377d5849d4.pdf?index=trueIn 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_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 5368 bytes
SHA-256: e1cf426567ffec5263c8bef0c0d7b648896ad6963a877e6c83e16067b6377f1f
font_01_sfnt_off00012f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F49 11624 bytes
SHA-256: adac65d24ce01868decd52051a48660bdaea59e038b09c15458556d9a7cff8c3

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