Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ba27f13a80a2f5…

MALICIOUS

PDF

78.9 KB Created: 2021-03-14 14:08:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 16c3c5ed504d78207f0839330a40a177 SHA-1: b2361aed0dea4df353b061763808f3169e09963b SHA-256: 88ba27f13a80a2f5b678ecc669f34a378c6ce16c8014bd5e96868a239e80bcbe
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to its generation, but no direct instructions or lures are clearly discernible. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://jottigo.ru/strik?utm_term=how+do+you+tell+the+difference+between+a+viral+and+bacterial+chest+infection PDF link annotation
    • https://cdn.sqhk.co/pigevikuwi/hbieB5a/8636871193.pdfIn PDF document text
    • https://cdn.sqhk.co/liweruruzed/hAhbRgf/games_like_cross_stitch_world.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/gibud.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/qija2AN/31879379893.pdfIn PDF document text
    • https://folatidaxewurel.weebly.com/uploads/1/3/4/3/134317863/zalul_jolorutuxe_jerikab.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/9ecc94f5e7b4.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/cfGihhe/29827562922.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/ictUygi/words_that_start_with_s_meaning_fun.pdfIn PDF document text
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/nelomabanexus-vofukute-bomis-tiziwefapas.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/beats_solo_3_vs_studio_3_comparison.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/7308221.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/Rshgchh/tunibuva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_eb0a230d037643aeb7fbdf2d2633735d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8328b9cc-f50b-4f9a-b57e-2f33afc5fbfb/how_can_i_study_real_estate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f29b01-78b8-4c06-aee5-bef1ef078509/83838784780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31608f69-6aa4-4a7c-b0fd-6d90ec159416/riniragisugabisubom.pdfIn PDF document text
    • http://tazuwaxerufuje.epizy.com/30834495018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1d1964-2652-404b-a170-0507307aa35d/do_you_have_to_reset_furnace_after_changing_filter.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_543b627825ae43089fd48b88dacf92f6.pdf?index=trueIn PDF document text
    • http://suboxasolu.rf.gd/nist_randomness_test.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_18925036a18643e48521cf67213b8f8e.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_6256a5665e014c6da6b57c56c3ce4867.pdf?index=trueIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_ddc90b841e7c4d1f9b558207b93dc7f3.pdf?index=trueIn 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_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 5464 bytes
SHA-256: 47e84725671735c592a89a91778e2549f1ef8acb103a7a6ef0121131592ef991
font_01_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 11628 bytes
SHA-256: 87e7789d45bbe806f65c8e75d6d62492ef6b684a38a7ff8d6586af772a6e63ca

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