Malicious PDF — malware analysis report

Static analysis result for SHA-256 571bd54b746e7414…

MALICIOUS

PDF

64.6 KB Created: 2021-02-20 00:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1bda80d78f75217796ae0c9c09576b35 SHA-1: 7f4d6e04ff0f0757f131a8452f804c98f963f44b SHA-256: 571bd54b746e7414ddceced84fd9eed978b99b8a8c1d19856e6ad8386729a4e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=robot%20coupe%20r2n%20continuous%20feed%20combination%20food%20processor PDF link annotation
    • https://cdn.sqhk.co/gulaxemetila/cgdS0jf/men_s_soccer_world_cup_2019_bracket.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/hjkmOGQ/sustainment_warfighting_function_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/falupuvevore/bhgxge0/73469088366.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/hjigeSW/training_programmes_strategy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5ff42938043a4.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jejhOii/jojowudavuv.pdfIn PDF document text
    • http://kosolibanun.iblogger.org/60634073981.pdfIn PDF document text
    • http://fijixedi.22web.org/suzanetenarekatodore.pdfIn PDF document text
    • http://clientesdkb.com/vudibebiwukusopcr3al.pdfIn PDF document text
    • http://50offstore.info/spider_man_far_from_home_online_latinonkvkw.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/qhcHjdT/talking_tom_wallpaper_apk_android_1.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/sin_pijama_lyrics_video_download3sdip.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/1ChfAC2/traffic_racer_motor_hile_indir.pdfIn PDF document text
    • http://covidcapsule.world/99249463722w5vn5.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/XiTjbhb/bopejuxatuserapugapapem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5fe383c49ae12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tozemuj.rf.gd/mebirunadexum.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/kcrg_tv_guide.pdfIn PDF document text
    • http://newubopuga.epizy.com/chittagong_university_admit_card_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/70243578524.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_off0000bfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEB 5548 bytes
SHA-256: b95297919036041174277d724c215a90e52be66216b25434a9cb4f9212509db9
font_01_sfnt_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 10096 bytes
SHA-256: 6b1d1d5a8a05db58d55eafc8e4063648f0f8a69bae2890e6f70314a6369fdc94

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