Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3bd405dbd973b2…

MALICIOUS

PDF

82.7 KB Created: 2021-03-28 16:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c5a8894c1e083ad73beeb79b327d75ae SHA-1: b6aabef40bdac594e53972e6f206fb362946957e SHA-256: 8b3bd405dbd973b22d366a3bf6feb7003326b149111a5ac7b93d49b9047a4f33
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains a large number of embedded URLs, many pointing to disposable hosting, designed to create a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the primary goal is to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=babel+library+pdf In PDF document text
    • https://devivevapidon.weebly.com/uploads/1/3/4/7/134711806/3884573.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/171449f.pdfIn PDF document text
    • http://kisewoweg.iblogger.org/new_dj_song_bhojpuri.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/joxotugifab.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/skeeter_davis_the_end_of_the_world_lyrics_meaning.pdfIn PDF document text
    • https://pusenosegunilo.weebly.com/uploads/1/3/4/7/134705238/700079.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/jeluruguxuwev-jukanuri.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/occupational_health_policy.pdfIn 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/08ca003e-ba98-4a68-8cb0-2fbb330de2b5/how_fast_can_a_2020_mustang_go.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_6d0ffaea3dbf4d508a797c392fef8d9a.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_116fdc8e3faa4997b2c8f888ee11659c.pdf?index=trueIn PDF document text
    • http://dizogusuvi.rf.gd/34823672738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39737029-e32b-4e74-aaa5-ba4fae277003/58325556312.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/12960057767.pdfIn PDF document text
    • http://mulagokonud.rf.gd/28792713929.pdfIn PDF document text
    • http://sawezigulafufa.epizy.com/xuzuwuw.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/lajinetuwigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2086cd02-facf-464e-9889-ebd0931ac967/sofemivovoreledat.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_1667918398b4409f8ba4c408b94a9085.pdf?index=trueIn PDF document text
    • http://juzoduseba.rf.gd/blackberry_bold_9700_user_manual.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_5491ebe8f7474fc1a1c01b6db0bab3d9.pdf?index=trueIn PDF document text
    • http://punejiva.epizy.com/74965709691.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_7a32d5cc4fe2483e831703affe2bd625.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_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 5148 bytes
SHA-256: 121bc3ca153842253c405c4dfb46aadaf6102d47356678c27b546fa79ae465ca
font_01_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 11876 bytes
SHA-256: d7dd225836bdb54ac5147543f933f44df34420f9983e32e12f44c93c8759d52b

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