Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4fd2e2b512c2a1…

MALICIOUS

PDF

77.5 KB Created: 2021-04-06 14:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: db169d86512637b98b364e7aefa6a120 SHA-1: 9b2353dd1e752be49fed8fc273582ba5c8864e89 SHA-256: fb4fd2e2b512c2a1b80b0caed64b3db06b7e5f898db7f314347975d8438208cc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=messenger+lite++apk+file PDF link annotation
    • http://nukuxarigikuxez.iblogger.org/couple_quotes_images.pdfIn PDF document text
    • http://vodoroding.info/givejibafeladua9y71.pdfIn PDF document text
    • http://stassikorskyi.com/acer_h233h_monitor_hdmi_problems3lrd1.pdfIn PDF document text
    • http://24goodstore.site/17042889763hf8ym.pdfIn PDF document text
    • http://tepafuvofes.iblogger.org/majaroni.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
    • http://dujepuxa.rf.gd/alzheimer_unam.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/naruto_volume_16.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/baxudusuxirokafejixivoze.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/sosasamajumixibit.pdfIn PDF document text
    • http://budapetag.epizy.com/policy_of_appeasement_ww2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49931513-97fc-4e99-a78c-22773dda7d6d/can_a_shape_be_both_congruent_and_similar.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/bakugatetivonifabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1623fe0-864c-42d5-9fe1-251633eb1816/how_to_change_battery_in_liftmaster_gate_opener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bc2e59-a672-4c82-951a-f42fdf99b4e7/ipod_touch_6th_generation_ios_support.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4329216-306e-4ab3-986b-d07384ffecba/the_fisherman_and_the_jinni_full_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bfd1e0-693b-4c7b-b462-4c875a151161/jokozusabedejop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dad51b7-315f-4d76-b352-cbc982f39b07/femedikuxasade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd6da39-6068-415f-9581-51d71c492ec1/62817446701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a498a6-55f9-42a9-ab77-af6e130f76d2/dipokanudasuwefidubulek.pdfIn PDF document text
    • http://rosuvutoxuwi.rf.gd/wufibupuxatozifu.pdfIn PDF document text
    • http://zegemipufe.epizy.com/you_can_group_noncontiguous_worksheets_with.pdfIn PDF document text
    • http://popirarubinuluk.rf.gd/metastatic_melanoma_treatment_guidelines.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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 4816 bytes
SHA-256: 3521ab21cec02ace5115a4e301153ac544888401ffed150aada2f65ba68c189a
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 10788 bytes
SHA-256: 27579600692e3c1f1039e340f206d2f895b11b8523446fd351ecc54dfefca2e5
font_02_sfnt_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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