Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7c766c8cfe87b0…

MALICIOUS

PDF

78.5 KB Created: 2020-12-28 03:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ec2438428cd4cd815325c279fd7c6e1 SHA-1: 7af5a055c930d8720f5df4d1effc755b48493489 SHA-256: ad7c766c8cfe87b0ed63aca5eea741dd09412e938e3657b0a79f17dee53af6fd
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one to 'trafficel.ru', suggests a link farm or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

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-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://trafficel.ru/123?utm_term=lg+front+load+washing+machine+code+ue
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/1892892.pdf
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/dubukibaxo-ginevunalawibe-vudalobamazufu-rakirumi.pdf
    • https://nanezafukixepa.weebly.com/uploads/1/3/4/5/134526153/4939205.pdf
    • https://dexoxewivovevub.weebly.com/uploads/1/3/4/3/134322619/7ae87e295b.pdf
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/jateja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gewuwasi/telephone_sales_enquiry_form_template.pdf
    • https://uploads.strikinglycdn.com/files/4d240786-28b3-4348-820d-56a1b1b6c382/keduv.pdf
    • https://s3.amazonaws.com/gavobawum/18245379018.pdf
    • https://uploads.strikinglycdn.com/files/a1960a12-a84a-40b2-bd55-adfb0c3d406b/warframe_polearm_mods.pdf
    • https://uploads.strikinglycdn.com/files/09fb5515-2531-447c-942f-bcc17b3d44f0/vedavowirozikevefedamujat.pdf
    • https://uploads.strikinglycdn.com/files/8c7431b6-496f-4e67-8f30-de851e097cf0/walmart_employee_training_manual.pdf
    • https://s3.amazonaws.com/taruzudov/gabriel_air_shocks.pdf
    • https://s3.amazonaws.com/webipejonavuv/civitavecchia_map.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_off0000e021.bin
c7f1c7feaa95c165a45553b345c57e760a9bb4ecb28ff466be8479f66b0db2c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 5832 bytes
font_01_sfnt_off0000f422.bin
5f2eeb680cfb913b7f30eafb89078137e83e1135dac0c163190963aad6837e88
pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 5468 bytes
font_02_sfnt_off000106aa.bin
b0f6d00c1dcb628e51d60692cd645be0db08748b57a890763c6b72859ddc787f
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 10600 bytes