Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec2bcdb9a46c853…

MALICIOUS

PDF

81.0 KB Created: 2021-03-28 18:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c6fb54f13a7687adaeae8848442a148 SHA-1: 5b0aaed5ec1fa4dc66f4e9069d7de4653369b09c SHA-256: aec2bcdb9a46c853553bd0b3a8d6bb8bf60c981869f4870d4a1e8a87f16836ef
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on cloud storage services, suggesting a link farm designed to manipulate search engine rankings or distribute content. One of the primary URLs, 'https://golowaki.ru/wix?keyword=resident+evil+5+apk+download', indicates a lure related to downloading software. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/wix?keyword=resident+evil+5+apk+download
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/0e35a0.pdf
    • https://wuvozova.weebly.com/uploads/1/3/4/5/134500004/4596122.pdf
    • https://rivoliga.weebly.com/uploads/1/3/5/3/135311175/9ef28e2.pdf
    • http://jaxebememapi.iblogger.org/26081057588.pdf
    • https://ripaduwik.weebly.com/uploads/1/3/5/3/135311581/6464124.pdf
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/5988421.pdf
    • https://kemewekodu.weebly.com/uploads/1/3/1/8/131857474/4089946.pdf
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/jilusomesu_sojalopexix_puledejov_repizolosa.pdf
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/jenadeboluduzit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/miwolezedubujoz/66196824568.pdf
    • https://s3.amazonaws.com/jewizopukuni/7066470041.pdf
    • https://s3.amazonaws.com/tirimofufemukat/fetafizajexalatiwumemanow.pdf
    • https://s3.amazonaws.com/jeromisixinolib/tewabaxasuzaxolodaxedibu.pdf
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_444240a662624f0d9cf5b1c90a7894eb.pdf?index=true
    • http://gobobanowis.epizy.com/xajijixukutojazafapubami.pdf
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_d53f5ff5c0ee424a9d5e86bcd2f5e38f.pdf?index=true
    • https://s3.amazonaws.com/fixararololu/tenulakobekoxivewanuner.pdf
    • http://podoremekuzepo.rf.gd/do_newborns_need_car_seat_insert.pdf
    • http://wutidisixuv.epizy.com/nixon_regulus_watch_bands.pdf
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_2a46bae8ab144eebb3356b493b311b0a.pdf?index=true
    • http://repuvamiperubo.epizy.com/60848927068.pdf
    • https://s3.amazonaws.com/sizabo/glucose_transport_across_cell_membrane.pdf
    • https://s3.amazonaws.com/mexavofezoxi/directors_report_going_concern_example.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_off0000f348.bin
17ee637c00084dfa6e8a053da63d7c97e1324b4ab456510e480eee54810a16c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 5204 bytes
font_01_sfnt_off00010526.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 1800 bytes
font_02_sfnt_off00010db3.bin
b6653b8292789297d5658d2420db712ee3fc0c19b1ac3195fd7c9092755a2d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 11540 bytes