Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c31b147e4f2a105…

MALICIOUS

PDF

94.6 KB Created: 2021-04-05 17:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 29dde4b4f5d4db796a3ec46f4585c181 SHA-1: d8de3dd1f92bc3825ead863402fff855a72ce7f3 SHA-256: 8c31b147e4f2a105ae435ddce0d554f11c1390861d0d8145b454af5714a89b0f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/wix?keyword=oscar+et+la+dame+rose+pdf+online PDF link annotation
    • https://bumibosawo.weebly.com/uploads/1/3/4/3/134374517/ximuximejezupa_tofajepenakokun.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/risutumogerer.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/xineroponafol.pdfIn PDF document text
    • http://yogait.space/birthday_wishes_songyyv9h.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/what_is_auditory_phonetics.pdfIn PDF document text
    • http://familyit.info/daily_language_review_grade_30l2m9.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/muzeguwex.pdfIn PDF document text
    • http://fruitslope.online/citi_capital_markets_origination_analyst_salary0g5il.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/basketball_rules_for_beginners.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/19984751838tr7re.pdfIn PDF document text
    • http://wordsidepost.top/24086088776tvt9.pdfIn PDF document text
    • http://nexekeb.iblogger.org/75167941869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_e1a306f54ff849aab4683892e85463a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f74ed5-c1cc-44e9-bdcc-5a1ed2dd103e/tunodawob.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_a68e1cd919544d8996e99f13d3765fc7.pdf?index=trueIn PDF document text
    • http://rawozenagi.epizy.com/toxugobapow.pdfIn PDF document text
    • http://sopigovo.rf.gd/28174795841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5416b9c5-a9d0-455f-84be-a7947b36e30d/82732669530.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/23044218816.pdfIn PDF document text
    • http://bogetozepopizir.rf.gd/list_of_important_full_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406058cd-3e1c-4c0a-9e9d-4c334728cee6/does_judge_judy_show_pay_the_fines.pdfIn PDF document text
    • http://dilabopitomosif.epizy.com/37076991811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a1e9e4-b39f-447d-87d0-19f43830cea6/watch_fantastic_beasts_and_where_to_find_them.pdfIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_be511e40ac964e75a7c5bf7818740c99.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001388f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1388F 28540 bytes
SHA-256: c21bd345cf8819a507cf7bff3a4a61af3b1088f80891e370402d73354bcacc8f
font_00_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 5328 bytes
SHA-256: 6c04b4ac67599e5cdbcc0c1950080cea8cb5694c565d23541b2252947c746f43
font_01_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 10712 bytes
SHA-256: b85856710781f06c0285310b30f73cb5c00ce7e6a4dbaafb2c82968126b24f79