Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c4b2fa1738b707…

MALICIOUS

PDF

87.1 KB Created: 2021-04-05 19:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 13a2b67da403f4c98f3a69cfe6c8d58f SHA-1: de700e904f6b3a2ab4a56b5586bfcfa5d5dd39b2 SHA-256: e1c4b2fa1738b707f3b5ab3542ff79d0a1c8d530eb1178ef2e0b0f7cf82e759a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://crophysi.ru/strik?utm_term=liber+null+and+psychonaut PDF link annotation
    • http://mujojodisi.22web.org/parrot_ck3100_connect_iphone.pdfIn PDF document text
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/b1f8225132a22a3.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/9123807.pdfIn PDF document text
    • https://fupomojokom.weebly.com/uploads/1/3/4/4/134458651/xuludu_kutetonu_larisujew.pdfIn PDF document text
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/4928908.pdfIn PDF document text
    • http://lorutupaxuposu.22web.org/14247890035.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safodur.epizy.com/lufiwibijulidubafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c48b193-be18-48ed-8d65-c63200c152bb/oracle_12c_software_free_download_for_windows_10_64_bit.pdfIn PDF document text
    • http://wetovokerug.epizy.com/creole_english_dictionary.pdfIn PDF document text
    • http://fibotujipisozu.rf.gd/debt_inheritance_book_1_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875c1cd3-a525-4ef8-9691-29d86eed218b/pepum.pdfIn PDF document text
    • http://mujedofagogi.epizy.com/43427706461.pdfIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_d61f073b9f234368b65dc471426d218a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40b12d3-56fe-4290-bd8a-27d63001c94f/vufubosopijutumagusafo.pdfIn PDF document text
    • http://wasofiwomorap.epizy.com/bozorojigelewusozir.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_9ad1cb22adb74b8b80d75635ec5bd085.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_592c912af16c425eb3f59042bb1e9dc0.pdf?index=trueIn PDF document text
    • http://fibafewupo.epizy.com/cancer_papilar_de_tiroides_pronostico.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_661e90b8e3ae483e88d0f5d8f42b4aa8.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_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 5344 bytes
SHA-256: cb34e8ca896cd55c51e50d0bf01b087605f5fb7748923cd8646e68f3bbeff36c
font_01_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 11304 bytes
SHA-256: f4b90ec54dfeba21ae3ee2eec604774d07f4f88f81afe3d5e688dd5144b2c0b4

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