Malicious PDF — malware analysis report

Static analysis result for SHA-256 e544578927b9a91b…

MALICIOUS

PDF

86.3 KB Created: 2020-12-16 13:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 354372e5663faa615f91f8e5974fb6ba SHA-1: 188771bf120ba278d0fb38a8b2669f092c744a9f SHA-256: e544578927b9a91b2764c9f6c76ff33865ae02bf6dcc4431541d7deb953a5f2b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule indicating a mass of external links. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous external URLs, one of which is a suspicious domain, suggests an attempt to redirect users to potentially harmful content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=cat+ninja+unblocked+games+66+ez
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/26797.pdf
    • https://xotuwajugi.weebly.com/uploads/1/3/4/3/134349857/5285731.pdf
    • https://fifusikusivupe.weebly.com/uploads/1/3/4/6/134638905/5859044.pdf
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/rulerof-zujixizekilu-dasarisixutag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bezegoluzose/whatsapp_status_about_love.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf631edabee7b4406ce8b/1606219313448/73143231364.pdf
    • https://static1.squarespace.com/static/5fce6b7989ef447dc9d63afa/t/5fd1851499fe644e8a5810a3/1607566613452/pocket_rally_game_download_for_android.pdf
    • https://s3.amazonaws.com/zedilegol/80512771671.pdf
    • https://static1.squarespace.com/static/5fc64899f9866f3fd2f86f4e/t/5fcbe22d8dcc5603be0118c9/1607197230553/37193788125.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/liwapisulawon.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1a5731dcc34bf48e6bbe/1606228567652/lord_of_the_rings_symbolism_ww2.pdf
    • https://static1.squarespace.com/static/5fc0f22ee5c7695ca99bddc9/t/5fc16e14f81c9a2a0cd7fbb1/1606512154359/23541200706.pdf
    • https://static1.squarespace.com/static/5fc5abc8084698658e7ee89a/t/5fd6a5ec164d0f203c8668d3/1607902700782/blues_piano_chord_voicing.pdf
    • https://s3.amazonaws.com/mozirolinitaje/wedding_confetti_cones_template.pdf
    • https://static1.squarespace.com/static/5fc518149698b02c7f3bb327/t/5fd0e0b45347e801a82c1988/1607524537385/33674482771.pdf
    • https://static1.squarespace.com/static/5fc0e92a0a2757459be2ed0b/t/5fc4fb9c9b1ed03538793476/1606744988795/iboy_kevin_brooks.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105f4.bin
ad91981cc66e718b40cc05df5a917bd9a9c22558e4c741ae342dcd3c84f0d07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 5552 bytes
font_01_sfnt_off000118d3.bin
851aaa83a24f7ddf7f83d39c74851582018b4f57e1f0c440cc689b155c38e053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 11520 bytes
font_02_sfnt_off00013da5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA5 4324 bytes

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