Malicious PDF — malware analysis report

Static analysis result for SHA-256 82681ce0270b5420…

MALICIOUS

PDF

128.9 KB Created: 2021-03-18 09:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f23fbb6860ab86ca8f77ab51d6b14b79 SHA-1: 81a7b4f10dd6cc00cb44b58337394313ddb38774 SHA-256: 82681ce0270b5420476eb465669a0ffd3857aefe6426c142d81421624dda7f53
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely to lure users to malicious content or exploit kits. The presence of external URIs and the nature of the link farm suggest it is intended as a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=upfront+magazine+answer+key+march+21+2016 PDF link annotation
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/d8b2cb9.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/jufenop.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/jeggTiQ/reading_comprehension_games_3rd_grade_printable.pdfIn PDF document text
    • http://jaligovaw.iblogger.org/46998436778.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/1229255.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/4343536.pdfIn PDF document text
    • http://merogerofame.66ghz.com/jatovidu.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/aii6o5m/volume_booster_apk_root.pdfIn PDF document text
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/zagubejorofu.pdfIn PDF document text
    • https://cdn.sqhk.co/neganobasiwe/hIMha3m/9709371517.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/5jcjaig/road_trippin_tab_ukulele.pdfIn PDF document text
    • https://cdn.sqhk.co/teganipuputu/jijcjeW/jolly_jumper_sling_carrier.pdfIn PDF document text
    • http://soribowunalosu.22web.org/kiwisup.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/hhihY0K/datutuki.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/NjdBuha/splashy_meaning_synonym.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tirevotijo.epizy.com/bifake.pdfIn PDF document text
    • http://rajunuximu.epizy.com/spanish_accent_marks_worksheet.pdfIn PDF document text
    • http://darokajiwebag.rf.gd/62660858699.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/boxcar_information_meaning.pdfIn PDF document text
    • http://gomilivif.epizy.com/the_artist_s_way_12_week_program.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/emulateur_android_sur_pc_nox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ac25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC25 5964 bytes
SHA-256: 9019f7db75f1d51ecbcd9fb60c62dd8578785c6a03f4f9f4365d670e9742e50e
font_01_sfnt_off0001c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C06A 11584 bytes
SHA-256: 3e7fd5e5b03119187b130076f2c8617cb34d0b9b9f5d811dcc19f2f6018f4bee
font_02_sfnt_off0001e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7C1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e