Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f53961f64c72df…

MALICIOUS

PDF

75.7 KB Created: 2021-02-16 22:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 31029deed118bc5fdae3cd2c7c801844 SHA-1: d959ad7eaf377d7b95df5eea61e829a78ab56421 SHA-256: 18f53961f64c72dfbcd05ba69eb87394059d8434cffad864722dec2fcf5182da
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDFs, indicating a link farm designed to attract traffic or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://crophysi.ru/strik?utm_term=how+to+use+anova+precision+cooker+nano PDF link annotation
    • https://cdn.sqhk.co/powitaxixu/gqidFpm/to_do_list_ms_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/KyIDsjd/synchrony_bank_rooms_to_go.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/pepug_potaw_mejasemuj.pdfIn PDF document text
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/7dad08d72.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/51a01372d5b29ed.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/hbPjjhh/black_friday_2020_home_depot.pdfIn PDF document text
    • https://jewupoma.weebly.com/uploads/1/3/1/4/131437657/ae7d5f0d7f.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/3e4afd155b6b43.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/mavixu/sync_chrome_history_android.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/fortnite_save_the_world_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/langrisser_class_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/25698429023.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/jupiter_gustav_holst_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/immortals_fall_out_boy_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/15466180376.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/cadillac_deville_1997_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/ntr_songs_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/ariston_washing_machine_manual_wdg_862.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/75662228283.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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 5072 bytes
SHA-256: 81ca9dd6ac762e26a0daea8ac2f2652453f9ba451a11febea2b74096e01f4a99
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 11424 bytes
SHA-256: c91714174e039c4752def544582c9912f194d4e0a4b9799c1675edf8038bce87

Open this report in the interactive analyzer, or submit your own file for analysis.