Malicious PDF — malware analysis report

Static analysis result for SHA-256 82691e785e89fcee…

MALICIOUS

PDF

62.7 KB Created: 2020-03-28 02:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 2e29b38581cadcbc226cb37338791892 SHA-1: e8fb46bc16e51b953fadddd922dab662bd1e74da SHA-256: 82691e785e89fcee91f86f3c6d99ee97f4fc662bf6c3cbd72ba384eb19d0f315
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment. No scripts were extracted, and the document body is largely unreadable, but the link farm pattern is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hounslowgiving.org/uploads/1/3/0/4/130483348/130483348.html#20+oraciones+con+pronombres+personales PDF link annotation
    • http://thecurrentcafe.com/uploads/1/3/0/5/130551661/b88e3c497e452.pdfIn PDF document text
    • http://martinezbraceslv.com/uploads/1/3/0/3/130323908/d0c950.pdfIn PDF document text
    • http://tacaccountants.com/uploads/1/3/0/5/130588550/915904.pdfIn PDF document text
    • http://jordynoakland.com/uploads/1/3/1/3/131383746/178a2d0.pdfIn PDF document text
    • http://sixwaysfromsunday.org/uploads/1/3/0/3/130379415/d9fa05b412244.pdfIn PDF document text
    • http://digitalheartstrings.net/uploads/1/3/0/5/130590321/4767410.pdfIn PDF document text
    • http://amberbellemusic.us/uploads/1/3/0/7/130740077/fedd26d88.pdfIn PDF document text
    • http://mhschangefoundation.org/uploads/1/3/0/6/130639212/pebomiwagula-vekuzawojuwe-xemiji.pdfIn PDF document text
    • http://rocksolidskilltraining.com/uploads/1/3/0/5/130550903/relumugigumave_gofowop.pdfIn PDF document text
    • http://www.hkscmi.com/uploads/1/3/0/5/130546333/e57ba9f8.pdfIn PDF document text
    • http://www.krystadesigns.com/uploads/1/3/0/5/130552097/da417cf.pdfIn PDF document text
    • http://sinergiakinesiologiayfisioterapia.com/uploads/1/3/0/6/130604903/98bb4.pdfIn PDF document text
    • http://velocitydancestudio.com/uploads/1/3/0/6/130639872/nezuvoxu_vovijexejurof_pugizuze.pdfIn PDF document text
    • http://cflucktraining.com/uploads/1/3/0/3/130323311/vobijosemafo.pdfIn PDF document text
    • http://verniceartmagazine.com/uploads/1/3/0/8/130814172/mazugiwavizidu.pdfIn PDF document text
    • http://kinderwebz.net/uploads/1/3/0/8/130814007/012003c76b87.pdfIn PDF document text
    • http://�refam.dk/uploads/1/3/0/4/130478520/telafeji-vanijopuron-pufikotasunomo-mofifokabikenis.pdfIn PDF document text
    • http://fbcnewton.net/uploads/1/3/0/7/130739597/4667158.pdfIn PDF document text
    • http://cutleryclubofamerica.com/uploads/1/3/0/7/130775374/272797.pdfIn PDF document text
    • http://www.bestreviewscbd.com/uploads/1/3/0/8/130813466/d2b8437.pdfIn PDF document text
    • http://thedepths-game.com/uploads/1/3/0/5/130541597/7915007.pdfIn PDF document text
    • http://studioschmidtllc.com/uploads/1/3/0/3/130379251/vuvawitinexitop.pdfIn PDF document text
    • http://commonwealthneuropsychologicalassociates.com/uploads/1/3/0/5/130589198/4906548.pdfIn PDF document text
    • http://www.jennathompsonmusic.com/uploads/1/3/0/5/130590282/kumenajeleji-moraxulu.pdfIn PDF document text
    • http://www.dryeyestl.com/uploads/1/3/0/6/130621757/vuzubigebedikat_tepifupuzowelib_xupipobenajoroz_ditamimifujikus.pdfIn PDF document text
    • http://xn--refam-uua.dk/uploads/1/3/0/4/130478520/telafeji-vanijopuron-pufikotasunomo-mofifokabikenis.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB377 9100 bytes
SHA-256: 3ccb28c066ba630b9bafd4990343fce24d4a5f13c56fc046a21f616326171ef0
font_01_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 16756 bytes
SHA-256: 41fe86bbb02ed6d595784473ead779d86c0e949a1d4f1b02e12a05451a664fb1