Malicious PDF — malware analysis report

Static analysis result for SHA-256 b565f557789f04e5…

MALICIOUS

PDF

43.9 KB Created: 2020-06-07 11:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 162de394db8c53559afb7da0f714a088 SHA-1: 4487353e8d488f45ccb94c8fa53f1956c9e7c728 SHA-256: b565f557789f04e59499664f9e86fcfa4d064f19a1063c1f35c5af526730a17b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, identified as a link farm by the PDF_SEO_LINK_FARM heuristic. The primary URL points to a document titled 'Basit harmonik hareket ders notlar1 pdf', suggesting a lure to academic or informational content. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the sheer volume of external links hosted on unrelated domains points to a malicious SEO or traffic-driving scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://74-123-75-218.mgwnet.com/uploads/1/3/1/4/131437689/131437689.html#basit+harmonik+hareket+ders+notlar%25C4%25B1+pdf
    • http://themightywonders.net/uploads/1/3/0/3/130313169/kakid-domuralejojuna.pdf
    • http://irismigraineandwellness.com/uploads/1/3/1/0/131070604/kiwog_zelezusozugug_vizimi.pdf
    • http://missoulalaw-firm.com/uploads/1/3/1/6/131636702/dopifumuxo.pdf
    • http://kaiaenergyflow.com/uploads/1/3/1/3/131398025/lomazuze.pdf
    • http://lightscameracake.com/uploads/1/3/0/4/130476601/6366101.pdf
    • http://siamthaithaicuisineonline.com/uploads/1/3/0/6/130639351/moxen.pdf
    • http://thekregels.com/uploads/1/3/1/6/131637583/3333664.pdf
    • http://webmail.jenisonchoirs.org/uploads/1/3/0/4/130489081/4085958.pdf
    • http://stemteachershou.com/uploads/1/3/1/4/131453170/3423393.pdf
    • http://the1500.com/uploads/1/3/0/8/130873849/dofasisefurimut.pdf
    • http://violethealth.net/uploads/1/3/0/8/130874382/3450063.pdf
    • http://mta-sts.mx.goodtimeserved.com/uploads/1/3/0/8/130813511/wawijekupu.pdf
    • http://stemteachershou.com/
    • https://jumuxek227837891.files.wordpress.com/2020/06/60377362220.pdf
    • https://levamine.files.wordpress.com/2020/06/wekukawelim.pdf
    • https://judirowekeva.files.wordpress.com/2020/06/menare.pdf
    • https://dotewagem810992031.files.wordpress.com/2020/06/vejikog.pdf
    • https://toximutuzowu.files.wordpress.com/2020/06/8891737597.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e1.bin
03efdda2b73d4ed81816cb35a2af8611ff2d306d73f96c5871ae25535d620c45
pdf-font-stream PDF embedded font (sfnt) at offset 0x64E1 12464 bytes
font_01_sfnt_off00008be0.bin
3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE0 16096 bytes