PDF malware analysis — malicious · de8550f30c97cae3

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 10:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: f98fede483667fa0ce33925ea0ae64d1 SHA-1: 77999d4934763a2ee112f6b45f018d88c32525e5 SHA-256: de8550f30c97cae3a24d9b38b941f326e4765beabaaf3023c19272f4ea4356ed

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded links, including one pointing to a known malicious redirector infrastructure at 'https://yafferge.ru/strik?utm_term=shelving+books+library+of+congress'. The document body, though heavily obfuscated, contains text related to 'Shelving books library of congress', likely a lure. The presence of multiple links on disposable hosting suggests a phishing or scam attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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
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 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://yafferge.ru/strik?utm_term=shelving+books+library+of+congress In PDF document text
- https://cdn.sqhk.co/kawiwitifa/jalY1vp/50596319276.pdfIn PDF document text
- https://cdn.sqhk.co/jiluputumusi/biegfia/89010485110.pdfIn PDF document text
- https://cdn.sqhk.co/zedawuzijis/IheWjea/shooting_games_for_chromebook_unblocked.pdfIn PDF document text
- https://cdn.sqhk.co/rejiwosujupa/7jfRhfE/makaforiku.pdfIn PDF document text
- https://cdn.sqhk.co/zimuvipejo/rcjcfsF/balena_etcher_linux.pdfIn PDF document text
- https://cdn.sqhk.co/xidafigutoxa/cBS3b1t/72940791508.pdfIn PDF document text
- https://cdn.sqhk.co/dujagazatad/hcjidYw/dragon_quest_builders_2_room_recipes_restaurant.pdfIn PDF document text
- http://vulifux.66ghz.com/4549156233.pdfIn PDF document text
- http://garantiya62.ru/what_did_george_say_before_he_killed_lennie9t1u8.pdfIn PDF document text
- https://cdn.sqhk.co/jakovenuz/E2RFqid/facebook_app_for_android_tv.pdfIn PDF document text
- https://cdn.sqhk.co/riwifesineji/3gihf14/gudoraxumanakor.pdfIn PDF document text
- https://cdn.sqhk.co/rasidepad/hhggia6/cake_recipes_from_scratch_without_buttermilk.pdfIn PDF document text
- https://cdn.sqhk.co/xedasuzefer/phcgihh/97039230718.pdfIn PDF document text
- http://gdztut.com/the_long_haul_definitionk2klt.pdfIn PDF document text
- http://reawolt.online/91032878682rgk4r.pdfIn PDF document text
- https://cdn.sqhk.co/fuzomorikat/nicmgjR/anime_boy_paint_by_numbers_uk.pdfIn PDF document text
- http://gdztut.com/75497042393amnjm.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://dazimosanugep.epizy.com/emergent_literacy_skills.pdfIn PDF document text
- https://s3.amazonaws.com/punurum/clydeside_sheet_metal_ltd.pdfIn PDF document text
- https://s3.amazonaws.com/gaxuremewuger/punjab_university_registration_challan_form.pdfIn PDF document text
- https://s3.amazonaws.com/lomuper/dilute_phase_pneumatic_conveying_system.pdfIn PDF document text
- https://s3.amazonaws.com/sesafefanulokam/gemaraxexipuzukurukisu.pdfIn PDF document text
- http://tosodesuvivat.epizy.com/workout_log_template_google_sheets.pdfIn PDF document text
- https://s3.amazonaws.com/wemofodi/indian_brokerage_house_reports.pdfIn PDF document text
- http://kazewuwebam.rf.gd/camminare_correre_volare_sabrina_rondinelli.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f414.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF414	5612 bytes
SHA-256: `7c2f857db96b81b9a9ff83d24789b57a230ed19c969089006a0d37031c919eda`
`font_01_sfnt_off0001073d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1073D	10864 bytes
SHA-256: `a1d4cc719c5de84138ee4f55729f7d2fdcdaf738443b729494963ea3b99a8f3d`

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