PDF malware analysis — malicious · 90b5ecd5450fae27

MALICIOUS

PDF

94.7 KB Created: 2021-04-03 22:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 900f5f0887a97d8f42b86bc74087bd15 SHA-1: 53abe2a43d9d80aa36c3d2f5c79b1afd58f7112f SHA-256: 90b5ecd5450fae27951a1f482da176111bc3868ebc2d6cb395b4dd0eff0fc996

134 Risk Score

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. It uses an urgency-based lure. 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 0.9996

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 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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://nipisod.ru/award?keyword=integrative+organismal+biology+pdf PDF link annotation
- http://koprovk.xyz/better_than_before_audiobook_frees1ooc.pdfIn PDF document text
- http://depalowivejal.iblogger.org/aashiqui_bengali_movie_ankush_hazra.pdfIn PDF document text
- https://cdn.sqhk.co/tosuwukiwate/cdhh5jf/70529063032.pdfIn PDF document text
- http://robertferrell.net/wesiwenedkarci.pdfIn PDF document text
- http://mamivadusijuf.iblogger.org/84006578517.pdfIn PDF document text
- https://cdn.sqhk.co/jivonaxadu/dzu51Y6/zafavuvo.pdfIn PDF document text
- https://cdn.sqhk.co/dujuxafetot/j47ijie/microsoft_teams_download_for_windows_free.pdfIn PDF document text
- https://cdn.sqhk.co/serodozire/beRgehW/download_ultimate_motorcycle_simulator_mod_apk_revdl.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_f0f096e2630749db8dd97d5b1a7bc45e.pdf?index=trueIn PDF document text
- https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_caaf819a502946f293658efb2128a467.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/b1d7e588-c716-4bc7-9093-faa6dab7b6e7/the_criterion_collection_streaming.pdfIn PDF document text
- https://s3.amazonaws.com/zifozujiwi/sidalizoni.pdfIn PDF document text
- https://s3.amazonaws.com/kobivimelelo/why_does_dyson_animal_pulsing.pdfIn PDF document text
- http://lixevenenofu.epizy.com/duvazijozun.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9c932e69-4b16-4c56-aea2-3467748d5a62/how_to_learn_electronics_engineering.pdfIn PDF document text
- https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_766514f5d0814a3a9a37753e13fa404c.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/fenatagazise/kafojo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9020e565-722d-4650-b931-aeab739ac78b/how_to_find_percentile_from_z_score_calculator.pdfIn PDF document text
- http://zemadepa.rf.gd/calvin_klein_bra_size_guide_uk.pdfIn PDF document text
- https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_dc21871c690d4be2857847501cd4611e.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/sosupejuxofedo/2092284948.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00011a5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A5B	5600 bytes
SHA-256: `66ffbde03b5cd93c4faf323dd7d7a19674b9451e17c1e0d936c7a2d00e566f27`
`font_01_sfnt_off00012d5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D5D	11912 bytes
SHA-256: `ac19747ec571a924f8806623980b3833ece29180eedd81542fa512b5eeafa89f`
`font_02_sfnt_off00015652.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15652	16172 bytes
SHA-256: `98e61ef0eee184491389eedffad6483e6d8ed088da7405a334da36aeb48d06e1`

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