Malicious PDF — malware analysis report

Static analysis result for SHA-256 1244f5531cd6d62c…

MALICIOUS

PDF

78.3 KB Created: 2021-03-03 01:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbe5f558cfe98788bdedbf4863ecbbaa SHA-1: 2e22ed6a18f05a923398b7f4c06f82c64a0e3a31 SHA-256: 1244f5531cd6d62c5c721fa4ef91970705607cabe8827e9a43775fe97ca4bc89
136 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing-related trojan. It contains multiple suspicious URLs, with at least two identified as invisible links designed to trick the user into downloading further malicious content, such as the PDF hosted at http://managerprogram.live/65786965073hle8p.pdf. The document body, though heavily obfuscated, suggests a lure related to 'completing the square worksheet 2 answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://nipisod.ru/123?utm_term=completing+the+square+worksheet+2+answers
    • http://tryse.xyz/city_of_saints_and_thievesr0rya.pdf
    • https://cdn.sqhk.co/jimikafede/VshcnO9/spam_call_blocker_for_landline.pdf
    • http://mizebojusur.mypressonline.com/63459486656.pdf
    • https://static.s123-cdn-static.com/uploads/4413112/normal_5feaf971962b5.pdf
    • http://rollernefrit.xyz/wogibirutuponejogopekifatogbw7.pdf
    • http://redirunna.xyz/refewamu2f5j.pdf
    • https://cdn.sqhk.co/kavejufa/bngedbI/computer_style_lock_screen_mod_apk.pdf
    • http://managerprogram.live/65786965073hle8p.pdf
    • http://paganel.world/xanipowawono10um.pdf
    • http://vashmaster.info/design_of_concrete_structures_noteszwj1x.pdf
    • https://cdn.sqhk.co/jarebomu/dQkggaI/65125886020.pdf
    • https://static.s123-cdn-static.com/uploads/4403273/normal_5fed6b23adb02.pdf
    • http://paxabak.mypressonline.com/76333630489.pdf
    • https://cdn.sqhk.co/rujiwujik/dYsWjel/park_it_charlotte_app.pdf
    • https://static.s123-cdn-static.com/uploads/4370273/normal_5ff624645270d.pdf
    • https://cdn.sqhk.co/puxedimuwo/i2gcjjd/web_designer_jobs_in_bangalore_for_experienced.pdf
    • http://fsfsfd.xyz/68476526600bcnh0.pdf
    • http://present-mag.ru/zugusukirivizumefitixo0a48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zevesijuduma.atwebpages.com/petit_prince_chapter_3_summary.pdf
    • http://zagofij.onlinewebshop.net/40438645508.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_off0000e535.bin
3759dcb61d90104f26853815ced1dd38964f0f4c7ec1f74f12dc25536195c46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 5552 bytes
font_01_sfnt_off0000f7f1.bin
1a66256ffca0099e36bfeb6ee299f724e4c39bf52155668eb6f60246a1ba8a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 3128 bytes
font_02_sfnt_off000104b5.bin
b4c51fa0b909ca3c32599944b40ff6f4a486e9196387488a48de3d3c28f3ce0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 11160 bytes

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