Malicious PDF — malware analysis report

Static analysis result for SHA-256 3108e69566675226…

MALICIOUS

PDF

74.1 KB Created: 2021-02-06 05:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 78de6ea940893778ac10650af08d675d SHA-1: 2a227d7cf97741ab30224930bdea8517a0f4d7d9 SHA-256: 3108e695666752267153cb5ef6308ea83053ebeeaef2fccff7c46b93d284caa7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and a link farm heuristic points to a tactic of overwhelming the user with choices, potentially to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=14x1.5+lug+nuts+open+end PDF link annotation
    • https://cdn.sqhk.co/migixurej/hcgggiX/calendar_2021_with_holidays_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hchjOo1/hundred_years_war_battle_of_orleans.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/gd3jgvT/onesite_facilities_mobile_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/qiaNgds/66461126701.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/jj6JZji/blood_and_glory_legend_unlimited_money.pdfIn PDF document text
    • http://vorecan.fun/kepipjbrd2.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/L5Pghif/ranodibugitike.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/527341.pdfIn PDF document text
    • https://dosolixegu.weebly.com/uploads/1/3/4/3/134340741/denoxoz.pdfIn PDF document text
    • http://mscredit.info/vidofomiw5n2qc.pdfIn PDF document text
    • http://pivifemopore.22web.org/astroneer_apk_android.pdfIn PDF document text
    • https://bamebifubakuta.weebly.com/uploads/1/3/1/4/131408159/58fa0.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/FEZhglF/61102704157.pdfIn PDF document text
    • http://my-favshopf.online/84948279197v2kk8.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/5jgijij/wikipedia_english_dictionary_offline_free_download.pdfIn PDF document text
    • http://detonicufficiale.website/essentials_of_understanding_psychology_11th_editionymtc6.pdfIn PDF document text
    • http://rujawobezixevib.iblogger.org/bahay_katay_shareen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xigilozixorod.epizy.com/56272336389.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/platform_bed_frame_wooden.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/61590270786.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/catholic_school_uniforms_cheap.pdfIn PDF document text
    • http://ribaxexumipo.rf.gd/basanni_baa_song_mp4.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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 5088 bytes
SHA-256: be0d3d98613bf916760b78e6e69faebd901a12694a9bb35bf4f987105de2e406
font_01_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 15408 bytes
SHA-256: 8a765195b39ab04a8473fd8f0591c36bdcf623db1b4b3948e25d9299b870698b

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