Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e07538fc9f9938…

MALICIOUS

PDF

72.1 KB Created: 2021-03-17 20:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5588b6f183dcbab697aa3a46e9801607 SHA-1: 8f12725130a9265ba513cf80809268211b568ab8 SHA-256: 38e07538fc9f9938fd5840e1114fdc1e4d7f24b42e0b73abd4d128f7d54d7455
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one specific URL is flagged as a potential phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links designed to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=clicker+garage+door+keypad+owners+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454435/normal_602a147c12fbe.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/ghKOzhj/55700082551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369323/normal_5fed1c5b12e91.pdfIn PDF document text
    • http://tigusomoxuwij.22web.org/sondico_goalkeeper_gloves_size_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5fff716fc17aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_6014bbe74d06e.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/f6Agi4k/red_rose_wallpaper_for_desktop_full_size.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_6002107f68025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_49750acd9124477289dd8b288d5a9101.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_1439109f4e084a539611cff6a6deb18f.pdf?index=trueIn PDF document text
    • http://lijulipewagikev.rf.gd/27821660730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77a44ba-45bd-471b-a285-5be0cf3ac114/how_to_connect_to_wifi_samsung_printer.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_f1186d869e19478a86d1cbcd72d36fbd.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_54854e9f60b1429981d33e88ef1e759c.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_bfaf5231144e4bc598825c0e7602b985.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0a0031-f15a-4b75-9262-d2ae52bf6046/42336882403.pdfIn PDF document text
    • http://vijagomifeka.rf.gd/best_3d_games_offline_for_android.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_e17c1fe907ca4df892e9b0040d00c211.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_6ba7b060c098445b8649968ee8300c27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a5d719-48c5-4954-8787-fda31e353186/ap_human_geography_unit_2_summary.pdfIn PDF document text
    • http://rosukijabadizi.epizy.com/passport_renewal_child_canada_form.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_13fcf0dd8c394088b3564f557b0f25aa.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_eeaefb9fe740439ea051e9a9ce896433.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_4b23d7fb7d43498aa485580455a91996.pdf?index=trueIn 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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 5556 bytes
SHA-256: 6e863773e0ce964e707b6a966a1057c3f05a1adf3023e0ccb90092f113e5f474
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 10720 bytes
SHA-256: 13308ce97c80a0dbd170259b41863ce180f3e2b8977558cee713e31702e8af4d

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