Malicious PDF — malware analysis report

Static analysis result for SHA-256 be146bac1a5b89ca…

MALICIOUS

PDF

69.4 KB Created: 2021-09-18 07:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e797186d0f6c24ce4345987c2e3d0c70 SHA-1: d232c7f1b171fa50d79f5fb570c242c0e9c347b4 SHA-256: be146bac1a5b89ca40262b7cead87cc5ea465252f9d66b468959e7fa4b3c2a8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and the overall detection as a trojan indicate it's likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://word.mn/uploads/assets/69022589963.pdf In PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/13670548300.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109121131399340.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/2031532255.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/55926197657.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/boxogegokulumidipemux.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/26308306293.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/kekiwu.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/54874167637.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/96154675139.pdfIn PDF document text
    • http://bdsductri.com/upload/files/65939715932.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/vududupugexerewu.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/mibadekerutefujidomoniw.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/bowileduzesojovirusosokax.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jebemekipibemopixut.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613469d0310a6---kepowiwowodidozek.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/93128086456.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/sisoluwenedidaririti.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/72356550991.pdfIn PDF document text
    • http://nemochem.cn/upload/files/51197863993.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/sijipitulobanevuf.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/dolol.pdfIn PDF document text
    • http://matras-devison.com/upload/file/6238828693.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa9228aa9d---60235052717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+unlock+old+iphonePDF 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_off0000b2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 14880 bytes
SHA-256: 44939f1985422fefc37fc80d0c7c3acdb922e217ea83a2249a1496e8b94ce1ca
font_02_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 10452 bytes
SHA-256: 317efa6c3cc03160c4bacf9e65142247595aa1211a94667afa3d5a7433b3af40