Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ae8ca34d951905…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 17:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ee5f3efaf4b34c85614da3f629564db SHA-1: bee53e198cb83a136353e16c89a0927b033e2015 SHA-256: a7ae8ca34d95190532233c84b488adb01704804e17727b2709c86a0f67a0e391
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting an attempt to direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the high number of external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://tallerescarrion.com/uploads/file/69009110897.pdf In PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/61588089691.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/35103d11cf2a2338dafd06d7492dd188/munupovikutekasilarixafex.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/48735055521.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/wawumomuveti.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/zilukabozekawasuguguv.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/gelatuvipiburikenije.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363403368b4---popatanasofawuvav.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/dosafejunaxejiw.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/xixugiv.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/putuvuba.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/11855491444.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/beloguwozoxepu.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/59562993587.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/99520002248.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/wagigagasi.pdfIn PDF document text
    • http://air-con.ru/upload/files/limonetakenenifudib.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kevobodufaxume.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/vunavubosineru.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/ludolegutiwitonusiketir.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/14557923616.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/poginekuvopi.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/sisejapuvitutusuzis.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/gunegame.pdfIn PDF document text
    • http://muszempilla.com/files/file/58248862526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=high+res+sky+backgroundPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84D 10944 bytes
SHA-256: 2cd161356bd7b8b1e654d4e97404050c3557ef441823a62180a762ae519f3321
font_01_sfnt_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 15604 bytes
SHA-256: 11243ad38b0de2985bd4c95e47cf8e51a94dc7c4310efaf62102904643453dd9
font_02_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1