Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e7528e01176084…

MALICIOUS

PDF

77.8 KB Created: 2021-03-27 10:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 80799e8d0b391327e8725a6a550f2b1d SHA-1: 5b68af6d94787e0d8dbad31978ecea9750fe9367 SHA-256: e4e7528e0117608421457e963f40635fee2a107dddd2156579ded6cd395eb680
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 0.9991

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://dugedepap.ru/award?keyword=network+topology+mcq+pdf PDF link annotation
    • https://cdn.sqhk.co/zuxosutuku/mhbjjif/tamemalepudipanepu.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/ajbhdji/vce_file_convert_to_online.pdfIn PDF document text
    • http://particulieres-societegenerale.best/pocket_legion_roguelike_battles7shdv.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/iiYhbge/neo._emu_paid_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/y7RYidq/90173216442.pdfIn PDF document text
    • http://top-odejda.com/sharp_aquos_lc-60le640u_will_not_turn_onkgoxj.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/oFhccia/mini_manager_soccer_world_cup_2019_live.pdfIn PDF document text
    • http://ing-cliente.com/fidorewukapoe9z5k.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/cjac5qr/baxolanasitokuwuwib.pdfIn PDF document text
    • http://damita.fun/62699886270eek2s.pdfIn PDF document text
    • https://cdn.sqhk.co/doxufojixene/hhjcAie/how_to_sharpen_rotary_mower_blades_by_hand.pdfIn PDF document text
    • http://luminar3-download.xyz/how_to_turn_off_aprilaire_humidifiercu19n.pdfIn PDF document text
    • https://cdn.sqhk.co/negenowiji/cbihJig/feluparaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/hngghcz/7611338184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_20916258670540338745e31b9d595254.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_df56510860414628b13597eca2ee09aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/spider_man_game_for_pc_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d5b558-ccba-4f56-96d7-548f7d726870/30_second_elevator_speech_examples_for_college_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a76269e-3dac-4a63-b5cf-832e88284a20/why_do_germinating_peas_respire_more.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7cb48f-d32d-4b1d-8d37-bbfce3d00e3c/59819827876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd411e1d-18ad-49bb-9e13-32e3c1903500/how_many_calories_are_in_a_wendys_spicy_chicken_sandwich.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_840930cef59a4b7f8ab96d164c6a613b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/annoyance_crossword_puzzle_answer.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_d7bc011eca1042db9b68b9207db8aded.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_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 5440 bytes
SHA-256: 002eb80df9eb77817757f15cd9e5fc77643a2e920cf45e76a17bab8572d5aef7
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10732 bytes
SHA-256: 95f84f734753a3c301426d49b827ea36f4d771baad5b99b6b9b649e324ae61bb