Malicious PDF — malware analysis report

Static analysis result for SHA-256 690a7725a6857ad2…

MALICIOUS

PDF

83.9 KB Created: 2021-06-14 01:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1d282861f7168bdb20d327a98ae4e1e0 SHA-1: e5f43b6415ab3ab667343341732248f4b83fc778 SHA-256: 690a7725a6857ad2d6144dcdcf677d580bc0380c7693f870adcb5b895deb7b64
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 0.9996

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://synerhu.ru/pbw?utm_term=sherlock+holmes+full+movie+download+in+dual+audio PDF link annotation
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/57e912d.pdfIn PDF document text
    • https://xekobemakisusij.weebly.com/uploads/1/3/1/4/131438823/ritumamijixa_vuzabuved_vizukipejewu.pdfIn PDF document text
    • https://xuzelakojit.weebly.com/uploads/1/3/4/5/134593048/bumotodojuzepulanobi.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/1940819.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/xusurozug-fogilitolama-voruroxox.pdfIn PDF document text
    • https://sarerudaguf.weebly.com/uploads/1/3/4/3/134373173/a1695.pdfIn PDF document text
    • https://vegalatunom.weebly.com/uploads/1/3/0/7/130776393/xenopugeno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_60b978af96a43.pdfIn PDF document text
    • https://ruwiderok.weebly.com/uploads/1/3/4/8/134891429/kujosikitusifitevod.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/6535127.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/a8b9b9fee43e00.pdfIn PDF document text
    • https://mawebexakonu.weebly.com/uploads/1/3/4/3/134390129/4f2b083872b77f0.pdfIn PDF document text
    • https://somubedalirome.weebly.com/uploads/1/3/4/7/134719542/vuzagosodopab_zewuzewageko_bolumi_minifuso.pdfIn PDF document text
    • https://nuzokubipodopu.weebly.com/uploads/1/3/4/7/134732356/3928522.pdfIn PDF document text
    • https://semizafug.weebly.com/uploads/1/3/1/8/131871859/f471b75.pdfIn PDF document text
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/pusozuro_raretujaziwip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_60bec1a06ab83.pdfIn PDF document text
    • https://tigidebo.weebly.com/uploads/1/3/4/7/134740117/patigasebalogubujiju.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/c68a2dba-7d9b-48d2-bc37-799c82797ce1/asu_wifi_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0414c24b-5038-4edd-9760-299d71e221f7/aube_timer_switch_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d17b3b-038a-4ad2-8ff0-b59ce657e1d7/galaxy_dx_959.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 5580 bytes
SHA-256: 107db9cecdc172a672cfefba148e64e60db120933c3b00c9f7169e022e215e7b
font_01_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 12276 bytes
SHA-256: 36994c5619118ed3fb5621657e4065d1ae263b10afec401f2d1b4e8d577d32c9
font_02_sfnt_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd