Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a79c5c3c5ecf1cd…

MALICIOUS

PDF

84.0 KB Created: 2021-02-21 18:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d7e20c75f3625717c22004b0244a5918 SHA-1: 677f69c56a47bc5b41362bff03f170903d5b183c SHA-256: 4a79c5c3c5ecf1cdedbda0ba499389dff36b2a06e54000deb86b050b2a710cf0
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URLs suggest a phishing or SEO manipulation scheme, aiming to drive traffic to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=garmin+gps+128+power+cable In PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fe2391a6cd9b.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/jfih9hj/youtube_how_to_cake_it_pizza_cake.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/ji1IssY/vaxuwifoketimafidezuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476750/normal_5fce37f607e08.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/jepisij.pdfIn PDF document text
    • https://gugewixurot.weebly.com/uploads/1/3/4/3/134393699/bojevotexif.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/ic7M2ig/vomiting_in_dogs_with_lymphoma.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/gdjiiPt/jitijebobi.pdfIn PDF document text
    • http://rugozuravonabib.22web.org/comparing_fractions_and_decimals_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/3J6DPws/baduxezavosiraxabipudel.pdfIn PDF document text
    • https://cdn.sqhk.co/kagixepo/gieiii7/11134050914.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/nCboeih/safodeziboleki.pdfIn PDF document text
    • http://pifevowomekol.22web.org/the_inferno_3_episode_10.pdfIn PDF document text
    • http://gikilebi.iblogger.org/1490141986.pdfIn PDF document text
    • https://xonajababivoxo.weebly.com/uploads/1/3/4/0/134040492/damedo.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/hK3giNS/slap_kings_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/jagdIZk/truck_craft_dump_insert_wiring_diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/walgreens_humidifier_vicks.pdfIn PDF document text
    • http://xubeveg.epizy.com/tawalel.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/acls_bradycardia_algorithm_2018.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_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 5892 bytes
SHA-256: d13d89175f6a3a82898fea0239036bb44fc77c7bc32dfb71a8f174a9ece9d471
font_01_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 10624 bytes
SHA-256: fab807642ea28ad1394a9aea4635c9e8fde8cfc50dfbe0ecf53d81e2033b4660

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