Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc33e9d8358f3e0…

MALICIOUS

PDF

79.4 KB Created: 2021-05-11 14:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a508dbb87ac0cbf29813f90ca6e49c4d SHA-1: 1d4ee11f106521f36c39fea0b08d036a78c34aa7 SHA-256: ebc33e9d8358f3e05eec77d0c73c6f0df38768142a69fa9e81b386f31f34e0c7
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though partially garbled, suggests a lure related to removing printer ink, which is likely a pretext to disguise the malicious intent of redirecting users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/strik?utm_term=como+remover+tinta+de+impressora+da+m%25C3%25A3o
    • http://tipofeliluget.medianewsonline.com/kosotomugunofepexaxomaxel.pdf
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/judenikukug-natitudewami-nurugapixi.pdf
    • https://cdn.sqhk.co/jebozibiru/hflgd45/fimivega.pdf
    • https://putumilaw.weebly.com/uploads/1/3/1/3/131380263/xovib_bixatorivu.pdf
    • https://vigakamodibit.weebly.com/uploads/1/3/4/7/134770941/6235285.pdf
    • http://minesaxofunawi.getenjoyment.net/93674304535.pdf
    • https://memagakotis.weebly.com/uploads/1/3/4/7/134760483/368135.pdf
    • https://cdn.sqhk.co/fosigigamef/hidzmha/capsicum_extract_patch.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7cba8caa-09c1-4732-8d90-88b50468af4f/white_tiger_pictures_free.pdf
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_6876b04323584dbca33238a6f52057d4.pdf?index=true
    • http://satawakerexe.atwebpages.com/74078064544.pdf
    • https://s3.amazonaws.com/tezofuretejom/formula_de_ley_de_ohm_y_potencia.pdf
    • https://uploads.strikinglycdn.com/files/29ba7acb-8103-4677-86d3-63e5766c86d8/what_positions_help_period_cramps.pdf
    • http://riveminigokoxa.myartsonline.com/politica_de_calidad_concepto.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/greek_mythology_crossword.pdf
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_009ea025c08c4f86853c604bf53e86b8.pdf?index=true
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_6b87d991225f4ea5873b5c4a2e750413.pdf?index=true
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_eb691fdc1e474e8ca49a444a6bb1adb2.pdf?index=true
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_13dbfcf2a8a34268af9316ef9437fc31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25d76cd4-365e-4a71-9709-7d407c194c7d/maytag_top_load_washer_not_draining_completely.pdf
    • https://uploads.strikinglycdn.com/files/b646265d-a727-48bb-a3e6-4136dc545310/47427881484.pdf
    • https://uploads.strikinglycdn.com/files/1cedd160-944e-422a-ac19-ed027d8ca388/bafajuwekipujijigerez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d2.bin
dc0362964ce99086d912271c798289b7b7f81104900f5718b2853f9e59b7cc67
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 5356 bytes
font_01_sfnt_off0000f259.bin
949f380975c41cfa73f71f45f78d4adc3253168ece80e47490da267bc33792ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 12372 bytes
font_02_sfnt_off00011884.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 16204 bytes