Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac73e231742beac…

MALICIOUS

PDF

77.5 KB Created: 2021-02-27 08:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7ab61345d68ea120f7803490ec5f1c70 SHA-1: e1612aad064a8a481de606abf90c3a55865af23d SHA-256: 4ac73e231742beac790725a5d2a89a6143ef0cfef5cfb5f5d2ea2a5b41477bcf
126 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=how+to+reset+my+hayward+pool+heater PDF link annotation
    • https://cdn.sqhk.co/sojejinof/3jih3oo/sadimaronabenameboposisev.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/ac59dc7bae.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/rJgiihi/49353357503.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/gadukanivapogunivojiju.pdfIn PDF document text
    • https://paboripiniw.weebly.com/uploads/1/3/0/7/130739049/xonupobujenalix_vadakam.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/how_to_build_a_weight_bench_out_of_wood.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/what_size_tires_are_on_a_2005_chevy_equinox.pdfIn PDF document text
    • https://fidunisowasewi.weebly.com/uploads/1/3/4/5/134599354/6987975.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/42903272034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padubarejibuso.rf.gd/74053821641.pdfIn PDF document text
    • http://wirodugapilab.epizy.com/canon_speedlite_600ex-rt_ii.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/watch_dogs_2_live_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/genabejobemisureguku.pdfIn PDF document text
    • http://mulexotuvatago.epizy.com/invite_card_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/suwukekiwopabolugotubeta.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 3312 bytes
SHA-256: cb5c8c6405a97e289a1d37fd8f3fa0fb9a9e5cd02c3f475be668e5c7f8c23a8c
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 5356 bytes
SHA-256: a4dc5ef6b512deae7843279cbb3d36d6e1559eedb6061fdb99afa8f5dee88e69
font_02_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_03_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 10488 bytes
SHA-256: 3a4b1f6e8f975f20f95434c5c218685f87551a4f4ee5189acea652bb0d6f673b

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