Malicious PDF — malware analysis report

Static analysis result for SHA-256 87828feb04e873dd…

MALICIOUS

PDF

71.1 KB Created: 2021-04-02 04:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c59d4822da099c97c5a251d35579001b SHA-1: 2da4fc54916ac98fa7998447de288192f4f55401 SHA-256: 87828feb04e873dd1f66f9c984894e1dfef43931b19f5110656aec4116ed7d2b
186 Risk Score

Malware Insights

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

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 0.9997

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://dugedepap.ru/strik?utm_term=sex+offenders+houston+texas PDF link annotation
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/sujemepot.pdfIn PDF document text
    • https://kapadarobuziwel.weebly.com/uploads/1/3/2/6/132696145/pezet.pdfIn PDF document text
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/4896464.pdfIn PDF document text
    • http://natgood.space/15209263233pq4ke.pdfIn PDF document text
    • http://onlineeshop24.xyz/airlift_performance_logo_fontdw5zm.pdfIn PDF document text
    • https://vefapabawi.weebly.com/uploads/1/3/0/7/130740427/rowupox.pdfIn PDF document text
    • https://jubaluwaruzazux.weebly.com/uploads/1/3/2/7/132740890/rogitepemuzuboju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/16358bdf-0592-485d-9303-8bb1519ba44a/25388538392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b939bb5-c06c-4774-b389-0f4f70793d4e/how_to_win_an_argument_online_wikihow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce180deb-8aa8-493d-b794-ea9ac90c9338/arduino_uno_r3_cheap_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc73830-d7a0-4e35-be3c-0b3f916be8a8/80217259590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb19699a-d11e-454f-8d76-568e03e2ae5d/5738711970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484add4f-61a4-4fd1-ad49-7eaee5ddc204/what_mean_ninety-five_theses.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/wexexixejovedada.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/night_literary_terms_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ea4824-47c1-46b6-892a-44e2c2d8a642/tp_link_1200_powerline_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/when_you_reach_me_summary_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c905e49e-2dcc-460e-bf92-c3fd11714bfd/vikasuridejoluvexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a17b7b-89d7-4ead-a915-563171ff1fce/difference_between_rt-ac68u_and_rt-ac86u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08b3b4f-e38f-4fff-bba3-33ea422766d3/how_much_does_a_cochlear_implant_cost_in_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70347d89-a798-43fa-bc91-8a0b6030e63f/23422268920.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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 5132 bytes
SHA-256: 684cacfefefdaeaf6b7c0a58273e27419c966b44ea937718d23c0d32c05302f8
font_01_sfnt_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 10192 bytes
SHA-256: c22438b3bc5c986fd862cb73555908d947baef59e2b4a63000b7bb25164b4423