Malicious PDF — malware analysis report

Static analysis result for SHA-256 2def0ad1408433aa…

MALICIOUS

PDF

107.2 KB Created: 2021-01-01 05:48:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 875897d183e7c348edcb13a6179ebfcd SHA-1: 391c9557a0025b1a9e84d6fe2e3d8201a6fac7af SHA-256: 2def0ad1408433aa1dc4ad50d484d11f28e05be3fde09c4b98777a1766a6ea8e
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 0.9997

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
  • 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://trafffe.ru/strik?utm_term=not+guilty+meaning+in+kannada PDF link annotation
    • https://mupezoki.weebly.com/uploads/1/3/0/7/130739180/roruziza.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/lisixikomoba-sakorejo-fofudago-kiguw.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/1a359a97-5e52-4381-820c-d5c78951dfdf/nordictrack_exp_1000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d3c0018-69f2-488a-be30-b36499072ce1/6099291390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394ac231-3921-451b-8074-0b9e7ea2d45c/subexobuwan.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/ban_vs_afg_match_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4298caea-e016-47f1-8174-67ac911c709d/kasogagakobavisajurawapim.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/quran_bangla_translation_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1588f0b0-a132-41fb-b574-9a8b756b707b/dudilokorebuxidafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08e6cdc-56cd-4e18-bd06-66476253b17d/throne_room_lyrics_pentecostals_of_alexandria.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/hiring_request_form_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143fa0c0-53d6-4762-b043-9386b724d869/91737060505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f665d5-6489-4037-a233-932df5b9ee76/sisuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f658e2-f85d-4b50-88a9-54b0b2c4a5ef/canon_in_d_piano.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015df7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15DF7 10548 bytes
SHA-256: f9d947016808a0430688773b9d84d5563eed28e448a3ef6e5ae372b89a72e5e6
font_00_sfnt_off00014cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF3 5004 bytes
SHA-256: 2c86848a63ddfd7aab20708d656a94ec147383cadfd3333c3f7a12dc79a86c11
font_02_sfnt_off000178de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178DE 11508 bytes
SHA-256: 28afb2ffc765714acc7995706573b06e633b6be945598ba8b2e0420fd726cd23

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