Malicious PDF — malware analysis report

Static analysis result for SHA-256 7217a3918504b6f2…

MALICIOUS

PDF

87.3 KB Created: 2021-04-03 16:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4ccaf4ffd9687ec7e0cf615fe233120 SHA-1: 954c721f7b141ecb891dd415bfbef0f15eba453f SHA-256: 7217a3918504b6f27f16c8d0a4a218c8af42bf102535f23a26205a1e441d802c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and one specific URL is presented as a search result for 'best baby gate for stairs with cat door'. This indicates a link farm or SEO poisoning tactic, likely intended to drive traffic to malicious sites or distribute malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

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://resalured.ru/strik?utm_term=best+baby+gate+for+stairs+with+cat+door PDF link annotation
    • https://cdn.sqhk.co/rowofabuf/gigiZRG/45682741617.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/midif_kawebugizi.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/gggqsFu/bhojpuri_album_video_song_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/thhigig/ringtone_song_2020_dj.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/g2m3Hic/.pdfIn PDF document text
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/rizifevegewojibasage.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/2102551.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/07b4188b.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/a5uGhfg/expeditions_for_sale_in_georgia.pdfIn PDF document text
    • https://jolumipeba.weebly.com/uploads/1/3/4/7/134766715/6cf8c91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e4f21eab-331b-4af3-917a-c3a0618b9e55/how_to_refill_dymo_label_maker_omega.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/44936626681.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/new_home_orientation_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6abb14-6abd-451a-8885-6c3a96f10fab/zejuwinokomiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4745d10-1dcc-4ff4-b71b-37f97875e31c/12197722586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7692b5a-1967-4082-9f0e-7f20d15f3b13/12840532553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5821717-a72a-4654-af88-dc08d014eebe/55623763411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/100f94d0-01c6-4c80-830b-3bf0b0a539e4/foxconn_h-joshua-h61-uatx_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/nozumeka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 5316 bytes
SHA-256: d5c6292f795ee28479a215ccb260d9852afeecaa4347e11cad738494745d7204
font_01_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 11204 bytes
SHA-256: b485e4ff8fd1c417bddd8a225bc79c4a9362fc732e24e90d2d3a2e46f7ecbc02
font_02_sfnt_off00014161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14161 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34