Malicious PDF — malware analysis report

Static analysis result for SHA-256 445e6cc6b9fb321d…

MALICIOUS

PDF

43.3 KB Created: 2020-05-19 03:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9ea6ff25b97885982e1b3b69570405a SHA-1: 08070e645200ea0f664134fe2e670bb08495cab9 SHA-256: 445e6cc6b9fb321dd68d3acbd5ac37adefd3f74914cde088016aab1dccbd19d7
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern observed is the distribution of numerous external links, likely intended to manipulate search engine results or serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://cityautoglasstx.com/uploads/1/3/0/3/130379297/130379297.html#core+i5+650
    • http://yatraadvisors.xyz/uploads/1/3/1/4/131406372/53b2ed1199081f4.pdf
    • http://jetblackcopywriting.com/uploads/1/3/0/7/130776502/338fd4.pdf
    • http://ringeleygrandon.com/uploads/1/3/0/5/130550832/sekizililetonig-vonexivo-lunorigikosux-sosodiwinen.pdf
    • http://labrisegeneralcontractorll.com/uploads/1/3/0/5/130550912/mumuvixajus.pdf
    • http://jbrowneartist.com/uploads/1/3/1/3/131384544/jesenado.pdf
    • http://thetasktank.com/uploads/1/3/1/4/131452753/8312501.pdf
    • http://blufftonchurchofchrist.org/uploads/1/3/1/4/131408502/detelip-woxirude-xoridimefupikoj-metulejewi.pdf
    • http://awakenedactivismnow.com/uploads/1/3/1/8/131856959/1ee9605d.pdf
    • http://lukeandharry.info/uploads/1/3/0/5/130589135/3eae2187ba917.pdf
    • http://123poopitout.com/uploads/1/3/0/5/130546196/dedidovafap.pdf
    • http://ederklimatechnik.com/uploads/1/3/0/8/130874667/fesapokosi.pdf
    • http://core25.com/uploads/1/3/0/8/130814909/falobin.pdf
    • http://finanzschule.info/uploads/1/3/0/4/130435509/wuzisawasijeda_tixogalekazolo_suraru_tofolenak.pdf
    • http://firstandlastlogistics.net/uploads/1/3/0/4/130435725/c20fd8e75b0.pdf
    • http://pueblitodebarro.com/uploads/1/3/0/4/130476921/nojonulitojulavek.pdf
    • http://wattingen.nl/uploads/1/3/0/8/130814245/jexifosemumo_pubarirage_rexeruzomuma_mavitukogefo.pdf
    • http://andershanberg.dk/uploads/1/3/1/4/131437319/lidoruketa_rorojutos.pdf
    • http://bradgoodsontutoring.com/uploads/1/3/0/5/130550921/301db82.pdf
    • http://iamtinacious.com/uploads/1/3/0/5/130588390/2668047.pdf
    • http://findourfetishes.com/uploads/1/3/0/8/130873975/7755138.pdf
    • http://themovementsmethod.com/uploads/1/3/1/4/131454683/kowodarorev.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bd8.bin
39410fc5f1dedeb09f70dfc1cf2ca75ec05b6f5cea99fea98265eda196c2c8a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD8 23924 bytes