Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd5c7ca699b2d2d…

MALICIOUS

PDF

103.1 KB Created: 2021-04-12 20:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e3f33b96b6e554c99f2cd266b1fe977 SHA-1: 2da6ae610cfa3ca6e46c7bb361bb49b95922a6df SHA-256: 1dd5c7ca699b2d2d85b9ef040b7691db854b4faf2d49e802818d8f90ec81dc41
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "link farm" heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier also indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=how+to+lower+hill+rom+bed
    • http://pozuliruz.iblogger.org/46091680452.pdf
    • https://static.s123-cdn-static.com/uploads/4461766/normal_5ffa8ac17026e.pdf
    • https://cdn-cms.f-static.net/uploads/4483336/normal_603bdd1f149fd.pdf
    • https://cdn-cms.f-static.net/uploads/4471474/normal_6009c4adea603.pdf
    • https://cdn-cms.f-static.net/uploads/4426820/normal_602753507fe42.pdf
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5feffb4db1900.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_4a8bcf5f91874b609aafded1145601d5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f8b2d49-f401-416f-9d18-8d02f96591ef/geganeratotumoniwivugog.pdf
    • https://uploads.strikinglycdn.com/files/fe404b04-2a1c-457a-a86c-5785066152ab/battleheart_legacy_2_apk.pdf
    • https://uploads.strikinglycdn.com/files/e7063aec-2d8c-4c3b-b702-d37551fb6838/best_anatomy_and_physiology_books_for_nurses.pdf
    • https://uploads.strikinglycdn.com/files/9c24c661-5d20-47fe-803b-91e4e4626095/lubuxulepibipajarexela.pdf
    • https://uploads.strikinglycdn.com/files/a59fc74e-a370-4266-9840-7f0b61458fd1/6261659829.pdf
    • https://s3.amazonaws.com/nisiwanolom/pakobezegesud.pdf
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_fbada1d57a60488c9886880c75d4ae82.pdf?index=true
    • https://s3.amazonaws.com/jikopot/felibopuwipidado.pdf
    • https://s3.amazonaws.com/toguvaju/gipudosugaxota.pdf
    • https://uploads.strikinglycdn.com/files/c5f5a617-e3da-46d9-b850-d25b06581b2c/zepafibavugakeribob.pdf
    • https://uploads.strikinglycdn.com/files/44fcd1a2-d444-469d-a422-96f00b023e7e/evenflo_chase_harnessed_booster_install.pdf
    • https://s3.amazonaws.com/lanorolowu/bajapiwofevatikivo.pdf
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_917edeb5157442d1950aebfb18f20758.pdf?index=true
    • https://uploads.strikinglycdn.com/files/499e0bae-5bcd-4097-ad90-bff23926c4dd/gejowavaretoge.pdf
    • http://wanabovemuzume.rf.gd/88646905852.pdf
    • http://liruselewaviba.rf.gd/pannes_diagnostics_auto.pdf
    • http://tozoxefig.rf.gd/43441947393.pdf
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_a6b6f0ca54894731aab46686175bd561.pdf?index=true
    • https://s3.amazonaws.com/bajapovogam/xozelosabu.pdf
    • https://uploads.strikinglycdn.com/files/a15213ff-dc43-49b9-9db0-c5e78cb37aaa/braun_thermoscan_7_ear_thermometer_with_age_precision_asda.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014529.bin
c43cc6da25f92e40f10d786404661a996dcf01ab09051175616b526fd453429c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14529 4552 bytes
font_01_sfnt_off000154a5.bin
b2b98d92bfc9479189d78a853144e31de42ca17a55bd07fc8cfdfc790c636899		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154A5 12952 bytes
font_02_sfnt_off00017f05.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F05 4324 bytes

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