Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9f0c4ceacc0b08…

MALICIOUS

PDF

78.8 KB Created: 2021-05-09 20:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f74343872b88b1b090f4514b7a9e5de5 SHA-1: de1d04974e34c5bce91af2571132ee73263c186d SHA-256: 3a9f0c4ceacc0b086f793f7dbeb096747d69b75c10e83ac5dda1b9d47860e47c
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to SEO redirectors and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to drive traffic to external sites, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/strik?utm_term=lenovo+g50-45+drivers+windows+7+32bit PDF link annotation
    • https://velupilarase.weebly.com/uploads/1/3/5/3/135341581/da2d738c7.pdfIn PDF document text
    • https://mawetifatine.weebly.com/uploads/1/3/2/6/132683292/mapodutedowu.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/icogcsk/call_of_zombies_2.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/texolaj.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/jghnKig/brain_training_for_dogs_customer_reviews.pdfIn PDF document text
    • https://bezixaror.weebly.com/uploads/1/3/0/7/130739980/8351726.pdfIn PDF document text
    • https://kurexutolik.weebly.com/uploads/1/3/5/3/135350225/jififibeseku.pdfIn PDF document text
    • https://lisevududotuwak.weebly.com/uploads/1/3/4/2/134265384/01dcd7ab7c.pdfIn PDF document text
    • https://kiziwovoxapi.weebly.com/uploads/1/3/4/6/134617524/545d8787890fce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xotomisen/best_books_to_read_to_improve_spoken_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7c4afe-1919-4ca4-98cc-1d4a88d94391/88050797451.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/retolupaxosipomarari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf87678-6a4d-46d6-96a2-9ea952f45511/tujajuvemasubirozezirofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50750001-f19b-4553-b908-2f3dc590bb74/39952408227.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/41915432006.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/69249426073.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/93568808508.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/80060263992.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/bumblebee_transformer_pictures_to_color.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/best_english_language_course_in_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5414d39a-efb8-489a-a7ec-48f1db7f2012/aew_revolution_2020_results.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/ableton_live_free_full_version_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc81e8f-9a71-499b-b062-6d7f3ccb8224/25851707960.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/ukulele_beginner_songs.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
font_00_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 5536 bytes
SHA-256: 6160b98f48c392b1ccbcc1bbc6bf6cc99ca642ff3f1e0d7623a3e226070124ea
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 11584 bytes
SHA-256: 32335162d3e298c6763a51202c40d0999610d911f3ebcb35c645a6cfe9dad879
font_02_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176