Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1118534ff28655…

MALICIOUS

PDF

140.5 KB Created: 2021-03-31 18:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2ec00ee2022d9a04c10f72da48daabef SHA-1: 09676f9a54cfcfc4b1b9423986d126b5db1f4b9a SHA-256: 1b1118534ff28655945304716db7a7e5257ecfab666034aca8a56f281ec868b0
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, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/strik?utm_term=parts+of+speech+preposition+examples+sentences PDF link annotation
    • http://sikakapu.medianewsonline.com/87940601665.pdfIn PDF document text
    • http://lnstagram-helping.live/getetepeuiyvo.pdfIn PDF document text
    • http://boldly-grow.com/20507373347ch2b3.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/libro_tecnologia_1_secundaria1xz0r.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://itgermany.net/best_browser_for_windows_7ablqk.pdfIn PDF document text
    • http://kurametugugu.mygamesonline.org/kopurufobamepumej.pdfIn PDF document text
    • http://milesnires.xyz/jafudoxejewonolikavepozuukggz.pdfIn PDF document text
    • http://kismykeitio.best/what_would_cause_my_washer_not_to_drainl4ojb.pdfIn PDF document text
    • http://xteenware.online/nobapovijogigovckq7p.pdfIn PDF document text
    • http://dle-tpl.site/jukokadijexidukarefe3et4.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/a7fa6c09-8498-4980-9873-531e98b2a6f5/can_you_use_a_bluetooth_mouse_without_the_dongle.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_44ed64f5101a4dc197f5994da235660d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc758ed-f98e-4141-8799-f606683c686f/activities_for_teaching_phonological_awareness.pdfIn PDF document text
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_02cde4f2fdc24afea33353f996fc294b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c03e4f-9755-49eb-a235-dbaa121cdb61/the_lottery_shirley_jackson_symbolism_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34dd67aa-7edd-43e1-ae2f-cc9601bc8ba0/pizabofup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df1842d-3431-4872-b112-c40dd40b23e3/can_you_die_in_layers_of_fear_2.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_off0001e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9B2 5324 bytes
SHA-256: 3f3932a5793619b63940519c2ba501bf1face883c284ff0972cc7909b0e600ee
font_01_sfnt_off0001fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBAB 11624 bytes
SHA-256: e24a35aeaf39fb458f8a931f17d7a051b6e98f2052a293b3aa34609de571cde5

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