Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7181b57d6930955…

MALICIOUS

PDF

104.7 KB Created: 2021-03-15 09:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c5a24a2b14fbc1ec73f020005d0097ae SHA-1: 8f99d231c15a56da096d1dfdc14643bf87191cb8 SHA-256: a7181b57d6930955760cca216fc15509584c5bdfd4fe2d6d5510cca06b25b830
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=free+bingo+games+to+play+offline PDF link annotation
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/2990623bfc298.pdfIn PDF document text
    • http://samyog.ru/how_many_hundreds_are_in_50000uzuwx.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/84656558689.pdfIn PDF document text
    • https://xonofuri.weebly.com/uploads/1/3/4/7/134706076/2818897.pdfIn PDF document text
    • http://motivawka.online/gatikezugarorubirom6pdcs.pdfIn PDF document text
    • http://usecabinets.xyz/vebobeknwhry.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/faminapesere.pdfIn PDF document text
    • http://good-production9.site/14953875492xzl2z.pdfIn PDF document text
    • https://niremavepuna.weebly.com/uploads/1/3/4/6/134625676/wudes.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/why_is_call_me_by_your_name_good.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/behavioral_theory_of_learning.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/fefuteruzibikob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sesuwifap.rf.gd/how_can_we_define_love_in_one_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f795e29-12bd-44ee-867b-337c6caf0330/jitefilujubipesor.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/change_to_kindle_format_online.pdfIn PDF document text
    • http://xuwolerapole.epizy.com/best_all-in-one_pc_australia_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8694cf-fe9e-465c-a24b-3d03b155872a/how_to_tell_if_carbon_monoxide_alarm_is_false.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536dcc2c-cbe5-4b70-8ed4-8adf4a83bcde/rujigitusorixojevux.pdfIn PDF document text
    • http://dagogedimin.rf.gd/74739535872.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/belajar_coding_java.pdfIn PDF document text
    • http://ripapekum.epizy.com/world_geographical_map_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10acf055-a8a5-4f92-9c9a-6966b44a0dd8/examples_of_professional_development_goals_for_case_managers.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_off00015c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C55 5420 bytes
SHA-256: 605c9b0c53a7db741bc81522981cc3377fac73978aac1f6b8dbd2aa19674d2dd
font_01_sfnt_off00016ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EBC 11364 bytes
SHA-256: b65dfc315b8e2687cf9c23e9a3bd085b8d1a7099a934723c627d3516cb8e56d3

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