Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e76f58edf4b01b…

MALICIOUS

PDF

73.2 KB Created: 2021-02-04 13:07:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3453ddd51c398a4d6e86edb09a447890 SHA-1: 8cee89c9b8ec00d7ab1d9872d43dcbe0fa3ec3d3 SHA-256: d5e76f58edf4b01b37445c63f41faae8fe504e2416b558327a56a27ec660e12d
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, designed to lure users to malicious sites. The presence of links like 'https://yafferge.ru/aws?utm_term=efficient+frontier+in+excel+spreadsheet' suggests a phishing or malware distribution attempt, potentially disguised as relevant content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=efficient+frontier+in+excel+spreadsheet In PDF document text
    • https://cdn.sqhk.co/wosepimi/hjhieKw/illuminati_mlg_clicker.pdfIn PDF document text
    • https://mugebixivezir.weebly.com/uploads/1/3/1/4/131484268/sanajiduxu.pdfIn PDF document text
    • http://storezone.info/mokoluzim12i0y.pdfIn PDF document text
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/tutarivukabebolu.pdfIn PDF document text
    • http://fartook.online/rolegapemibim9t0no.pdfIn PDF document text
    • http://buyfastedcircle.xyz/musipokuzigodujiruqodmc.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hUhbRca/does_my_crush_like_me_quiz_quarantine.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/gd9Jgf8/buxupegobibibuguzovuxib.pdfIn PDF document text
    • http://makamar.xyz/aphmau_hide_and_seek_map0qsuu.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/5461110.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/7215594.pdfIn PDF document text
    • https://cdn.sqhk.co/lasokixon/igT83gf/caroline_the_wrecking_ball_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/VnVBonp/kubitopa.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/fXothc9/how_to_download_pax_3_app_on_iphone.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/makixibawumebol/51742544056.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/vifafudevisi.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/background_hd_black_images.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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 5268 bytes
SHA-256: cfa9497c75f96f2fc805f99c950ad613c95698eb8b5aa9e8543b1e4f902ba6e1
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 12480 bytes
SHA-256: 7b037a8a8687a40a08fc692998cfeefca23a705739baf48999a566234f992060

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