Malicious PDF — malware analysis report

Static analysis result for SHA-256 385795cbf435f03b…

MALICIOUS

PDF

84.6 KB Created: 2021-03-17 11:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7324ae27b714e426befeea979c4f78d SHA-1: 10dee05901d96d5b04d486b79d2deed0160e0aa7 SHA-256: 385795cbf435f03b4948658c0f883222f4491a1967518736b41bc3601fe62dc7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to seemingly unrelated PDF documents, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://xajibur.ru/strik?utm_term=exchange+um+44009, which likely serves as a redirect to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=exchange+um+44009
    • http://latencfsrt.space/21076028365ozf9t.pdf
    • https://bigabupagekul.weebly.com/uploads/1/3/4/6/134667232/1765160.pdf
    • https://jevogebog.weebly.com/uploads/1/3/2/3/132303093/8e3d979c.pdf
    • http://whalesqpa.fun/sawikogefi4sy6p.pdf
    • http://6gusevshop.website/cintas_used_uniforms_for_salesgc9f.pdf
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/8738396.pdf
    • http://adminhalil.com/metodologia_de_la_investigacion_hernandez_sampieriihvf9.pdf
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/7b17562274.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/30fc7a1b-aff1-4e1f-87fa-3860ef029e61/how_to_change_battery_on_seiko_quartz_watch.pdf
    • https://3b1a0cff-dc54-4917-88c1-cdf904a8db56.filesusr.com/ugd/60aab8_e92da9d7bf79495c8f435cbbd023b380.pdf?index=true
    • https://uploads.strikinglycdn.com/files/109a3094-7413-46f6-876d-eee2459a54de/whirlpool_wtw4800xq2_parts_diagram.pdf
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_2e68dc896d024ea2b11b807c9796e1f6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c354ca5f-6fbf-40d7-9f6a-dc94a80703cb/shmuel_boy_in_the_striped_pyjamas_real_name.pdf
    • https://uploads.strikinglycdn.com/files/a5fc63b1-4a5e-42e5-a4b9-8e4a3b612f76/mavufufojazuzod.pdf
    • https://uploads.strikinglycdn.com/files/54b825bc-d648-405c-8a74-a5004b2ae135/30759158290.pdf
    • https://uploads.strikinglycdn.com/files/6fd36bf4-803f-473b-a230-1563473c933c/88223744201.pdf
    • https://uploads.strikinglycdn.com/files/e28dd7a4-e248-4a05-a376-8c0022d3e0a0/whats_an_example_of_allusion.pdf
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_ab863d84a5d6485ba4c2368b22e90755.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fea179a4-16c3-4e87-b126-49feeae2f1b5/ap_style_guide_headlines.pdf
    • https://uploads.strikinglycdn.com/files/bdd05f3a-521f-4483-9e63-2138f1002fc2/who_bought_savage_arms.pdf
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_a4a336955fec44fead725668b3a1b5ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35f98787-5e5d-45d1-908d-0e6b470233ad/25772687096.pdf
    • https://uploads.strikinglycdn.com/files/598866db-2106-4436-84bd-031ebeadf81c/kyocera_printer_default_username_and_password.pdf
    • https://uploads.strikinglycdn.com/files/3ab4f747-1748-4c84-8076-f4162cdf4569/zusekenugenafiwofazuvew.pdf
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_1f330d55651542668a5cbceb43c8061f.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a3.bin
0f595cad093f598379280540002ee45186598d374486498d0f878c53a069038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 4960 bytes
font_01_sfnt_off0001074f.bin
595d97071dc3553b9872d88641a6d2782645a24877ebd392aa18c5b0c77c364e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 2188 bytes
font_02_sfnt_off0001111a.bin
0c6f62f1ca73ec3a913b43d6900b676b0b1af6e5937285d31afd3093f2166de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 10852 bytes
font_03_sfnt_off00013639.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13639 4324 bytes

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