Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aed23003c88922…

MALICIOUS

PDF

98.5 KB Created: 2021-01-17 15:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 378d2473073aefc622cd15d791d96de2 SHA-1: e729546bf866967b1dd4f45d571c4b2cfed60fd3 SHA-256: 76aed23003c889229c548adbb030220e965847b97d447e05eef45052e23af784
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://traffset.ru/123?utm_term=vita+activa+meaning PDF link annotation
    • https://cdn.sqhk.co/zezovajav/gEXiaji/dalolisatipibipusevumaxad.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/fQ631gi/26124346014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5ff9a4e363080.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/52916955654.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/Ugejbxf/67325217776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5ff4bf5861ce2.pdfIn PDF document text
    • https://site-1176136.mozfiles.com/files/1176136/88358339569.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/f0fc5e41f7173a9.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/hiAi5hi/93946179849.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/jj3jb81/chrome_os_comic_reader.pdfIn PDF document text
    • https://cdn.sqhk.co/fanoxozowupe/5id7whf/othello_act_2_summary_litcharts.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/jejgEgi/cat_kitten_christmas_cards.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/ca6190166f37.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/zevugerapip-sawilowomulipat.pdfIn PDF document text
    • https://site-1175818.mozfiles.com/files/1175818/camera_drone_for_sale_uk.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/5976413.pdfIn PDF document text
    • https://site-1192787.mozfiles.com/files/1192787/barter_verb_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387054/normal_5fefcfb895934.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f5f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF5F2 4304 bytes
SHA-256: b4928a1d32848f4ee17ac0396b41f1038898ffee29b0d64678751438ead40b6e
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 4836 bytes
SHA-256: 1314e715b55ace7677c7dcbdab24d9b9c79dea2e05290fd8a780daef0e8c3ec9
font_02_sfnt_off00011596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11596 3364 bytes
SHA-256: cbb0d03048caf6e9e7e90d00fd576fa51e6b5636969c89b80fa787c9f4a3afbb
font_03_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 4388 bytes
SHA-256: 6d855494d19880ce3976dbf7c0fc47c6d59dce7fc92ff1b8f4627bc02b46b660
font_04_sfnt_off000130b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 11228 bytes
SHA-256: cede1174d9b11d6639965f854e3e070b4eef0fa7e8bf166a1e3b2f44dd2620fb
font_05_sfnt_off00015671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15671 16308 bytes
SHA-256: 147dc4b6904e311fed9fa3631aa5a4a9c862fed112f88aafde6dce1b6bce5611
font_06_sfnt_off00016c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C58 3160 bytes
SHA-256: 79d6eef20a2b5aebd31dd7bcc43a903b9da3a780154851e047e6ff8bc9004d89