Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea3f16154a8c0f2…

MALICIOUS

PDF

59.4 KB Created: 2021-02-10 22:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 261efc144aa87f6fbbc21ba9d17810a8 SHA-1: 5d5abd143894048fa5b9a773afb65060d636eb6e SHA-256: 7ea3f16154a8c0f2cda4ab9172645c987d58bd4225f30f49d131918038f561d5
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The document body appears to be malformed or truncated, providing no clear user-facing content, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 4

  • 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 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.
  • 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=ruslan+and+ludmilla+overture+sheet+music In PDF document text
    • https://cdn.sqhk.co/zejegure/HjEdjfg/4_pic_1_word_game_over.pdfIn PDF document text
    • https://ginabedo.weebly.com/uploads/1/3/4/0/134017532/7afa62f2714d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_5fd199b4b93bf.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/hIjbjbE/zombie_combat_sim_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/iW8jeig/top_100_bollywood_songs_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/gcgghkc/xafupomigaz.pdfIn PDF document text
    • https://doxugibako.weebly.com/uploads/1/3/0/7/130776338/sekimu_mafedumu_mitadanil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_6021630593fe2.pdfIn PDF document text
    • https://cdn.sqhk.co/dijadive/fLeWt2A/miami_skydiving_center_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/kjiPG16/76810851583.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/Z1ihQgi/photo_mix_app_for_ios.pdfIn PDF document text
    • http://jobesagaponapa.22web.org/kendo_grid_column_html_template.pdfIn PDF document text
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/kimididafibebemixuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5fd26149b6b90.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/jaOiddV/apply_defence_job.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusofiwu.epizy.com/bts_asthma_guidelines_child_2019.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/fire_emblem_awakening_guide.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 5244 bytes
SHA-256: 8e57c78b99e434d5ea0786fc6f29ca13aac6d1e703f4c3c4b247710416c24210

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