Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a95fd01ca62fcb…

MALICIOUS

PDF

66.0 KB Created: 2020-12-19 04:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 44f357fd0b5ce25798ebca4a618279bb SHA-1: d2bdd06ead6317fae1320fd9e0aa46264e8f8f22 SHA-256: 85a95fd01ca62fcb0b98d0c71b809c55ba369f13ece49e582c270a2b95bf51b5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafficel.ru/123?utm_term=sierra+reloading+data PDF link annotation
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/8965485.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/3b6c32dd0de92fa.pdfIn PDF document text
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/vulowoko-lojafuzo-tidinedotisif.pdfIn PDF document text
    • https://tekuximusiwax.weebly.com/uploads/1/3/4/4/134450812/sivixowigos_tejebive_latazugodusi.pdfIn PDF document text
    • https://sewigemebovoneb.weebly.com/uploads/1/3/3/9/133997870/pepofajerofa-xovemulosine-rorixonoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0abc6bda9c57a97bd16fd/t/5fc12fca3c6ccf69f388a732/1606496202713/action_and_linking_verb_worksheet_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d31ad9-eabb-44dd-8d23-81921905a4e5/gebinofunaxogovu.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/sentence_coherence_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0052111f6a4198480c96b/t/5fc5b60861e25426e1fd88d6/1606792713587/tejumuzif.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2cae0c30a162e0c5ec24a/t/5fc4e8a2f81c9a2a0c3c740f/1606740131347/ex_officio_nomad_pants.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fbb61c8c741314323605/t/5fc79595a3696915e229b511/1606915478817/ads_in_lock_screen_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c8ea0b6b03258f4e486d/t/5fcf2a18cd9a2056ff70b3c3/1607412248766/9671323132.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ac1588c99b6d37c7e4a8/t/5fd15c14c10336458b287b7c/1607556123648/70969291111.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c28ca5bc066edfa50021/t/5fc15642e6d49a06bbc41390/1606506051580/forbidden_limited_list_duel_links.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 4916 bytes
SHA-256: 2c3c704ae2e0b9ee42d9075f3d85bb090346f507074484febf7128c915fb6410
font_01_sfnt_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 10476 bytes
SHA-256: 858d6356ce4453bde716fa7ab109dbc9b9b6b09b0a5890b9ea95866c76c2c873

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