Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5547c71b2bd5d0…

MALICIOUS

PDF

106.0 KB Created: 2020-12-25 19:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b1772e53d437626bb28cfa5b42683a11 SHA-1: c2a75613359115bd9386aa676db155266193f0c9 SHA-256: 6d5547c71b2bd5d0a91efd5ddf2a7f4eb910e3998987ec7df2740a5425b910b5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a large number of external links, with one URL pointing to a suspicious domain. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to lure users to malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffset.ru/aws?utm_term=morphology+and+anatomy+of+cockroach+notes+pdf PDF link annotation
    • https://bawovaleza.weebly.com/uploads/1/3/2/6/132683088/5485634.pdfIn PDF document text
    • https://jubozofarubowi.weebly.com/uploads/1/3/4/0/134095851/6512f.pdfIn PDF document text
    • https://kipujoguburaza.weebly.com/uploads/1/3/4/3/134321983/legog_sikolafawelit_gepol.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/4234765.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/2df78ecb-6da7-4b8d-a786-cd498b4303e9/68495291924.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/picnic_table_with_attached_benches_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/wuvenesukoxapuwef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98f731f-4747-4b2c-9278-75285818caf0/the_killing_jar_siouxsie_and_the_banshees.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/96668588060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ce9e1d-6805-4468-ac82-e2eda1e047b8/four_seasons_realty_charlotte_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ed97ea-de89-4fb0-8f6d-08987c1e13f5/49311703394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95145cd-2012-4378-81b3-eee81bfe0bc1/josakokafured.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/marriage_not_dating_ost_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/apeman_dash_cam_c450_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/24913159208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11af7ed-511b-4d17-aaa9-1830688cbd13/86566243142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb041a1-d04f-4650-8511-7dff07dec0a9/prisma_guidelines_for_review.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15170 5740 bytes
SHA-256: e37f4269aea8669fb0098d4bf29c89044d05c30b858797237b7867bf3c879d94
font_01_sfnt_off000164a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A9 6364 bytes
SHA-256: 1bdb12399d76faa709a985205edf108cf776074ffae2a7b0eda646171f4c075a
font_02_sfnt_off00017444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17444 11260 bytes
SHA-256: 9f6a0a01776b247258898662c83538e732b3e4421d277b1f49ccb2107f100014

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