Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab896ec1fabdaf4…

MALICIOUS

PDF

89.3 KB Created: 2021-05-18 20:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3a0682c10880829f1cfc2e9ba51aab2c SHA-1: 1be7f7730fb2f451934a8f937d623bc97ae8dec8 SHA-256: 7ab896ec1fabdaf48a5ee52e4e2727d02fc05214a100ffd01c7c953c9739a568
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking PDFs, but one critical link to 'baarspo.ru' is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PRC/3D content and duplicate object bodies are common obfuscation techniques in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=porque+se+producen+las+infecciones+orinarias PDF link annotation
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/raxasipeva-dewosotoxut-zowaxulik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450870/normal_5fde710d1d8c1.pdfIn PDF document text
    • https://suxamoka.weebly.com/uploads/1/3/4/8/134876373/wezaxizoxo.pdfIn PDF document text
    • https://razijidepafex.weebly.com/uploads/1/3/4/8/134891772/wexepu.pdfIn PDF document text
    • https://rorumelet.weebly.com/uploads/1/3/5/9/135969221/722390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_60592fbfc9b09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446027/normal_5fed5a5edfede.pdfIn PDF document text
    • http://selolaz.66ghz.com/django_bootstrap_form_layout.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/wagelomip.pdfIn PDF document text
    • http://rewirujekinoxex.iblogger.org/83370399914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_602daac84f3b3.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/magapeguwabe/man_booker_prize_winners_list.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/melody_audio_songs_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adb814c-70f4-4b7f-b928-b38b94e007ff/casio_wr_100m_watch_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2e5af6-6e73-4d6b-886b-a0e216e9824f/jimudopofebesekugevu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/english_grammar_worksheet_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1848650c-dff4-4d3e-87cd-57afd3cd0169/24618815261.pdfIn PDF document text
    • http://favilogas.rf.gd/47339350992.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/sebukarawasewedowagatuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/boborurogoxaromiwis.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/paths_to_recovery_step_1.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/how_much_does_pacsun_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0e1d8f-c7c0-4572-a488-eba34ac7969f/mikejujokudemu.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/44882154286.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_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 5276 bytes
SHA-256: f415ffac3c341b8792f9f1722329c5addede2c232b84075474a7767c70235ef2
font_01_sfnt_off00012ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 11892 bytes
SHA-256: 5d60939bce379ebbc38ab58688bcb7207dc8b5a61f08188b4bd98b9550c7a845

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