Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b73991323fcffc…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 04:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c474ff26bb47486ceef0d7ca8de8de26 SHA-1: 1a1ddde7ac20318540e02b183809a2bfa6fe073e SHA-256: a6b73991323fcffc1c500610ee0eb5dce397f6cc5348a9b5bee446fbffe05819
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 0.9952

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://midufefew.ru/wix?keyword=how+to+hack+drive+ahead PDF link annotation
    • http://taxevidel.medianewsonline.com/51149261957.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/dbihwjd/hide_rec_screen_recorder_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/7AUjaid/6857354025.pdfIn PDF document text
    • https://cdn.sqhk.co/sozetojedisu/wG3jfhd/43734749283.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/ePjdhg1/zombie_survival_mod_apk_1._2._24.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/43119960024.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/gh8WiVV/show_me_bowling_alleys_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/jdiakha/lijisugupo.pdfIn PDF document text
    • http://bisoxixax.22web.org/benzilic_acid_synthesis_from_benzil.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/wjcgfhi/connected_investors_pin_v5.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/gEsAjia/fomilidatugob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_25eb66430a6c4e3781be7f69bf139231.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_aa80768453984ac1a54a585ae9c3417e.pdf?index=trueIn PDF document text
    • http://nerifumufuzu.epizy.com/likevixudumosobatugoti.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/econometrics_for_dummies.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/supisasabakedupusikanozab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb7be5b-3fc4-49d9-8337-c6343ef83ba7/the_travels_of_marco_polo_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9128e726-7f8d-4931-8b9b-2a298643618a/37743661311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2311e8f-391f-4fdf-b7d8-36526bfb4315/lakalumagirapuvin.pdfIn PDF document text
    • http://kiwesuvumu.rf.gd/37739673740.pdfIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/firufofebiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48fde7b-cd1d-427c-ae12-e8633615ca90/free_printable_world_map_with_continents_labeled.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_828e5a13c41d4c3da33897b155a3e169.pdf?index=trueIn PDF document text
    • http://boxawogirumi.epizy.com/53401808489.pdfIn PDF document text
    • http://molumazorok.rf.gd/a_man_will_not_cast_away_his_good_name_meaning.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_8bc5153b5d5740cf9cdc10284ff0eb4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c5ddf3-4ffa-4897-8102-bf23e974012e/59957622644.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_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 4996 bytes
SHA-256: dc39e5e93ddd260861b45d4af7cf8a28c3f5267057030fcd31bb93846e15ef23
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 10520 bytes
SHA-256: 18941300a10f777a31ab7a034ee3ecbba9f976fe83722dfd5ba47315237aac5d