Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fe17ce1db4740f…

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 23:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7e8553ddac6aed16a966d1ebc09d29a2 SHA-1: cc6ddd5cd501608be2fdf2d7c9d3093d2d236dea SHA-256: a3fe17ce1db4740f8d1a56bf08bf45c68790110543a70c0251a43827ce4ca77a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://mezovuduw.ru/award?keyword=breathe+in+the+heights+sheet+music+pdf PDF link annotation
    • https://bazotopefinuz.weebly.com/uploads/1/3/4/4/134435952/6128884.pdfIn PDF document text
    • http://kivakiwije.iblogger.org/jevudegekipixaradukofesu.pdfIn PDF document text
    • https://xanerenidijuv.weebly.com/uploads/1/3/0/7/130739333/dc5d01cecd3.pdfIn PDF document text
    • https://rajezedej.weebly.com/uploads/1/3/2/6/132682549/degilizet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_5fd7711d6633b.pdfIn PDF document text
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/goxewiv-monorijapep-loput-kiwowemigunupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495686/normal_60298fe6880ff.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/b6092fb864.pdfIn PDF document text
    • http://duvotikuvazax.22web.org/papikagarafe.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/xudowerudabuma_tekoguje_revuwajevezujo_fanojawijidobo.pdfIn PDF document text
    • https://nelixifejesuvol.weebly.com/uploads/1/3/1/4/131406681/mepibumolibapizix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_6037aa4f1dcc3.pdfIn PDF document text
    • https://ragurukenawuxif.weebly.com/uploads/1/3/4/6/134667210/zawegif.pdfIn PDF document text
    • https://vinixojaz.weebly.com/uploads/1/3/5/3/135312356/7688423.pdfIn PDF document text
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/bajogame_doxosakixemin.pdfIn PDF document text
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/2049712.pdfIn PDF document text
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/pidiwazekopoz_jululefanepe_wamixujukubujet.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/3603327.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/sudivokap.pdfIn PDF document text
    • https://lazogipinu.weebly.com/uploads/1/3/1/0/131069887/45c2b660e48ec42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/74668313119.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/fallen_in_love_lauren_kate_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/filehippo_teamviewer_12.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/favukufazezerewugixujat.pdfIn PDF document text
    • http://wepezip.epizy.com/61195819242.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/date_format_c_am_pm.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5588 bytes
SHA-256: 066c9c530b4455368e23c7bd3b5b4496eff3b4d7c952f3c738c46d55799406ac
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 10264 bytes
SHA-256: f78d66941d4cbc65ccb1d386cd2ef8a824e1ecebded82aed09c1d31854320688