Malicious PDF — malware analysis report

Static analysis result for SHA-256 3368fff74e57fe1f…

MALICIOUS

PDF

72.5 KB Created: 2021-06-07 13:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64bf0d4bb6acf8d25b1222b5c0b1d4fa SHA-1: bfa480d0ddb83589f7e6162c281d333d6e7283e7 SHA-256: 3368fff74e57fe1f7e2d559e9ca106ae68d8c13a9519df34215e024c29a19e12
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious content. The primary URL, 'https://smidgel.ru/pbw?utm_term=what+is+an+example+of+selective+perception', suggests a phishing or scam attempt by mimicking a search result. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/pbw?utm_term=what+is+an+example+of+selective+perception
    • https://cdn-cms.f-static.net/uploads/4470385/normal_601dca2f85306.pdf
    • https://cdn-cms.f-static.net/uploads/4446635/normal_5fd1d8efdc2e5.pdf
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/lutinosuxafojov.pdf
    • https://xiwevejuvufevi.weebly.com/uploads/1/3/1/3/131380641/nototebedorex.pdf
    • https://static.s123-cdn-static.com/uploads/4481157/normal_5fe1fae933276.pdf
    • https://demimawuna.weebly.com/uploads/1/3/5/3/135389973/809c5b587af756.pdf
    • https://sazomoravevak.weebly.com/uploads/1/3/0/9/130969829/b4814fccce9c860.pdf
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/gozumifezi.pdf
    • https://tovalowu.weebly.com/uploads/1/3/4/3/134375552/1546019.pdf
    • https://static.s123-cdn-static-d.com/uploads/4466151/normal_60b3d24b1685c.pdf
    • https://xomupufemi.weebly.com/uploads/1/3/4/3/134322732/labasakipap_vimemidubajerik_xowajovasofas_dolobewilo.pdf
    • https://pebizadovabunal.weebly.com/uploads/1/3/4/7/134711288/gebexam.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/8539002.pdf
    • https://cdn-cms.f-static.net/uploads/4498366/normal_606457f7699df.pdf
    • https://static.s123-cdn-static.com/uploads/4383561/normal_5fd092dc40794.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/18180674-78d2-4595-ba1b-a00591ca944e/can_you_get_monthly_dividends.pdf
    • https://uploads.strikinglycdn.com/files/8ccb0529-9b26-4354-9d62-9870ab183cb8/19677907849.pdf
    • https://uploads.strikinglycdn.com/files/cb5a9bd9-d871-4ed1-a974-7e7cd980d185/pebiwowebanulabopiba.pdf
    • https://uploads.strikinglycdn.com/files/8520854b-7892-4d58-9b58-bbe8c7d5066c/wouxun_kg-uvd1p_software_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/ae7c88f7-748e-4f3e-a1b7-80cda49ab822/89385946018.pdf
    • https://uploads.strikinglycdn.com/files/cb730420-f7b5-4f1f-950e-0d256a40632a/raxugurebesaboleguk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deab.bin
af8a48294501360fa0f55d98e92393434102b770276820e7e0a83161f242a03d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 5396 bytes
font_01_sfnt_off0000f0f2.bin
09b37dad2cd54f528433614b2710559bc197989427463de83712676ffdf42812
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 10396 bytes